Aquinas on Faith and Reason

II-II, q. 1, a. 4, Whether the object of faith can be something seen?

Objection 1. It would seem that the object of faith is something seen. For Our Lord said to Thomas (Jn. 20:29): "Because thou hast seen Me, Thomas, thou hast believed." Therefore vision and faith regard the same object.

Objection 2. Further, the Apostle, while speaking of the knowledge of faith, says (1 Cor. 13:12): "We see now through a glass in a dark manner." Therefore what is believed is seen.

Objection 3. Further, faith is a spiritual light. Now something is seen under every light. Therefore faith is of things seen.

Objection 4. Further, "Every sense is a kind of sight," as Augustine states (De Verb. Domini, Serm. xxxiii). But faith is of things heard, according to Rm. 10:17: "Faith . . . cometh by hearing." Therefore faith is of things seen.

On the contrary, The Apostle says (Heb. 11:1) that "faith is the evidence of things that appear not."

I answer that, Faith implies assent of the intellect to that which is believed. Now the intellect assents to a thing in two ways. First, through being moved to assent by its very object, which is known either by itself (as in the case of first principles, which are held by the habit of understanding), or through something else already known (as in the case of conclusions which are held by the habit of science). Secondly the intellect assents to something, not through being sufficiently moved to this assent by its proper object, but through an act of choice, whereby it turns voluntarily to one side rather than to the other: and if this be accompanied by doubt or fear of the opposite side, there will be opinion, while, if there be certainty and no fear of the other side, there will be faith.

Now those things are said to be seen which, of themselves, move the intellect or the senses to knowledge of them. Wherefore it is evident that neither faith nor opinion can be of things seen either by the senses or by the intellect.

Reply to Objection 1. Thomas "saw one thing, and believed another" [St. Gregory: Hom. xxvi in Evang.]: he saw the Man, and believing Him to be God, he made profession of his faith, saying: "My Lord and my God."

Reply to Objection 2. Those things which come under faith can be considered in two ways. First, in particular; and thus they cannot be seen and believed at the same time, as shown above. Secondly, in general, that is, under the common aspect of credibility; and in this way they are seen by the believer. For he would not believe unless, on the evidence of signs, or of something similar, he saw that they ought to be believed.

Reply to Objection 3. The light of faith makes us see what we believe. For just as, by the habits of the other virtues, man sees what is becoming to him in respect of that habit, so, by the habit of faith, the human mind is directed to assent to such things as are becoming to a right faith, and not to assent to others.

Reply to Objection 4. Hearing is of words signifying what is of faith, but not of the things themselves that are believed; hence it does not follow that these things are seen.

Whether those things that are of faith can be an object of science [Science is certain knowledge of a demonstrated conclusion through its demonstration]?

Objection 1. It would seem that those things that are of faith can be an object of science. For where science is lacking there is ignorance, since ignorance is the opposite of science. Now we are not in ignorance of those things we have to believe, since ignorance of such things savors of unbelief, according to 1 Tim. 1:13: "I did it ignorantly in unbelief." Therefore things that are of faith can be an object of science.

Objection 2. Further, science is acquired by reasons. Now sacred writers employ reasons to inculcate things that are of faith. Therefore such things can be an object of science.

Objection 3. Further, things which are demonstrated are an object of science, since a "demonstration is a syllogism that produces science." Now certain matters of faith have been demonstrated by the philosophers, such as the Existence and Unity of God, and so forth. Therefore things that are of faith can be an object of science.

Objection 4. Further, opinion is further from science than faith is, since faith is said to stand between opinion and science. Now opinion and science can, in a way, be about the same object, as stated in Poster. i. Therefore faith and science can be about the same object also.

I answer that, All science is derived from self-evident and therefore "seen" principles; wherefore all objects of science must needs be, in a fashion, seen.

Now as stated above (4), it is impossible that one and the same thing should be believed and seen by the same person. Hence it is equally impossible for one and the same thing to be an object of science and of belief for the same person. It may happen, however, that a thing which is an object of vision or science for one, is believed by another: since we hope to see some day what we now believe about the Trinity, according to 1 Cor. 13:12: "We see now through a glass in a dark manner; but then face to face": which vision the angels possess already; so that what we believe, they see. On like manner it may happen that what is an object of vision or scientific knowledge for one man, even in the state of a wayfarer, is, for another man, an object of faith, because he does not know it by demonstration.

Nevertheless that which is proposed to be believed equally by all, is equally unknown by all as an object of science: such are the things which are of faith simply. Consequently faith and science are not about the same things.

Reply to Objection 1. Unbelievers are in ignorance of things that are of faith, for neither do they see or know them in themselves, nor do they know them to be credible. The faithful, on the other hand, know them, not as by demonstration, but by the light of faith which makes them see that they ought to believe them, as stated above (4, ad 2,3).

Reply to Objection 2. The reasons employed by holy men to prove things that are of faith, are not demonstrations; they are either persuasive arguments showing that what is proposed to our faith is not impossible, or else they are proofs drawn from the principles of faith, i.e. from the authority of Holy Writ, as Dionysius declares (Div. Nom. ii). Whatever is based on these principles is as well proved in the eyes of the faithful, as a conclusion drawn from self-evident principles is in the eyes of all. Hence again, theology is a science, as we stated at the outset of this work (I, 1, 2).

Reply to Objection 3. Things which can be proved by demonstration are reckoned among the articles of faith, not because they are believed simply by all, but because they are a necessary presupposition to matters of faith, so that those who do not known them by demonstration must know them first of all by faith.

Reply to Objection 4. As the Philosopher says (Poster. i), "science and opinion about the same object can certainly be in different men," as we have stated above about science and faith; yet it is possible for one and the same man to have science and faith about the same thing relatively, i.e. in relation to the object, but not in the same respect. For it is possible for the same person, about one and the same object, to know one thing and to think another: and, in like manner, one may know by demonstration the unity of the Godhead, and, by faith, the Trinity. On the other hand, in one and the same man, about the same object, and in the same respect, science is incompatible with either opinion or faith, yet for different reasons. Because science is incompatible with opinion about the same object simply, for the reason that science demands that its object should be deemed impossible to be otherwise, whereas it is essential to opinion, that its object should be deemed possible to be otherwise. Yet that which is the object of faith, on account of the certainty of faith, is also deemed impossible to be otherwise; and the reason why science and faith cannot be about the same object and in the same respect is because the object of science is something seen whereas the object of faith is the unseen, as stated above.

q. 2, a. 1, Whether to believe is to think with assent?

Objection 3. Further, to believe is an act of the intellect, since its object is truth. But assent seems to be an act not of the intellect, but of the will, even as consent is, as stated above (I-II, 15, 1, ad 3). Therefore to believe is not to think with assent.

On the contrary, This is how "to believe" is defined by Augustine (De Praedest. Sanct. ii).

I answer that, "To think" can be taken in three ways. First, in a general way for any kind of actual consideration of the intellect, as Augustine observes (De Trin. xiv, 7): "By understanding I mean now the faculty whereby we understand when thinking." Secondly, "to think" is more strictly taken for that consideration of the intellect, which is accompanied by some kind of inquiry, and which precedes the intellect's arrival at the stage of perfection that comes with the certitude of sight. On this sense Augustine says (De Trin. xv, 16) that "the Son of God is not called the Thought, but the Word of God. When our thought realizes what we know and takes form therefrom, it becomes our word. Hence the Word of God must be understood without any thinking on the part of God, for there is nothing there that can take form, or be unformed." In this way thought is, properly speaking, the movement of the mind while yet deliberating, and not yet perfected by the clear sight of truth. Since, however, such a movement of the mind may be one of deliberation either about universal notions, which belongs to the intellectual faculty, or about particular matters, which belongs to the sensitive part, hence it is that "to think" is taken secondly for an act of the deliberating intellect, and thirdly for an act of the cogitative power.

Accordingly, if "to think" be understood broadly according to the first sense, then "to think with assent," does not express completely what is meant by "to believe": since, in this way, a man thinks with assent even when he considers what he knows by science [Science is certain knowledge of a demonstrated conclusion through its demonstration.], or understands. If, on the other hand, "to think" be understood in the second way, then this expresses completely the nature of the act of believing. For among the acts belonging to the intellect, some have a firm assent without any such kind of thinking, as when a man considers the things that he knows by science, or understands, for this consideration is already formed. But some acts of the intellect have unformed thought devoid of a firm assent, whether they incline to neither side, as in one who "doubts"; or incline to one side rather than the other, but on account of some slight motive, as in one who "suspects"; or incline to one side yet with fear of the other, as in one who "opines." But this act "to believe," cleaves firmly to one side, in which respect belief has something in common with science and understanding; yet its knowledge does not attain the perfection of clear sight, wherein it agrees with doubt, suspicion and opinion. Hence it is proper to the believer to think with assent: so that the act of believing is distinguished from all the other acts of the intellect, which are about the true or the false.

Reply to Objection 3. The intellect of the believer is determined to one object, not by the reason, but by the will, wherefore assent is taken here for an act of the intellect as determined to one object by the will.

q. 2, a. 9, Whether to believe is meritorious?

Objection 3. Further, he who assents to a point of faith, either has a sufficient motive for believing, or he has not. If he has a sufficient motive for his belief, this does not seem to imply any merit on his part, since he is no longer free to believe or not to believe: whereas if he has not a sufficient motive for believing, this is a mark of levity, according to Sirach 19:4: "He that is hasty to give credit, is light of heart," so that, seemingly, he gains no merit thereby. Therefore to believe is by no means meritorious.

On the contrary, It is written (Heb. 11:33) that the saints "by faith . . . obtained promises," which would not be the case if they did not merit by believing. Therefore to believe is meritorious.

I answer that, As stated above (I-II, 114, 3,4), our actions are meritorious in so far as they proceed from the free-will moved with grace by God. Therefore every human act proceeding from the free-will, if it be referred to God, can be meritorious. Now the act of believing is an act of the intellect assenting to the Divine truth at the command of the will moved by the grace of God, so that it is subject to the free-will in relation to God; and consequently the act of faith can be meritorious.

Reply to Objection 3. The believer has sufficient motive for believing, for he is moved by the authority of Divine teaching confirmed by miracles, and, what is more, by the inward instinct of the Divine invitation: hence he does not believe lightly. He has not, however, sufficient reason for scientific knowledge, hence he does not lose the merit.

 

q. 2, a. 10, Whether reasons in support of what we believe lessen the merit of faith?

Objection 2. Further, whatever lessens the measure of virtue, lessens the amount of merit, since "happiness is the reward of virtue," as the Philosopher states (Ethic. i, 9). Now human reasoning seems to diminish the measure of the virtue of faith, since it is essential to faith to be about the unseen, as stated above (1, 4,5). Now the more a thing is supported by reasons the less is it unseen. Therefore human reasons in support of matters of faith diminish the merit of faith.

On the contrary, It is written (1 Pt. 3:15): "Being ready always to satisfy every one that asketh you a reason of that faith [Vulg.: 'Of that hope which is in you.' St. Thomas' reading is apparently taken from Bede.] and hope which is in you." Now the Apostle would not give this advice, if it would imply a diminution in the merit of faith. Therefore reason does not diminish the merit of faith.

I answer that, As stated above (9), the act of faith can be meritorious, in so far as it is subject to the will, not only as to the use, but also as to the assent. Now human reason in support of what we believe, may stand in a twofold relation to the will of the believer. First, as preceding the act of the will; as, for instance, when a man either has not the will, or not a prompt will, to believe, unless he be moved by human reasons: and in this way human reason diminishes the merit of faith. On this sense it has been said above (I-II, 24, 3, ad 1; 77, 6, ad 2) that, in moral virtues, a passion which precedes choice makes the virtuous act less praiseworthy. For just as a man ought to perform acts of moral virtue, on account of the judgment of his reason, and not on account of a passion, so ought he to believe matters of faith, not on account of human reason, but on account of the Divine authority. Secondly, human reasons may be consequent to the will of the believer. For when a man's will is ready to believe, he loves the truth he believes, he thinks out and takes to heart whatever reasons he can find in support thereof; and in this way human reason does not exclude the merit of faith but is a sign of greater merit. Thus again, in moral virtues a consequent passion is the sign of a more prompt will, as stated above (I-II, 24, 3, ad 1). We have an indication of this in the words of the Samaritans to the woman, who is a type of human reason: "We now believe, not for thy saying" (Jn. 4:42).

Reply to Objection 2. The reasons which are brought forward in support of the authority of faith, are not demonstrations which can bring intellectual vision to the human intellect, wherefore they do not cease to be unseen.

But they remove obstacles to faith, by showing that what faith proposes is not impossible; wherefore such reasons do not diminish the merit or the measure of faith. On the other hand, though demonstrative reasons in support of the preambles of faith [The Leonine Edition reads: 'in support of matters of faith which are however, preambles to the articles of faith, diminish,' etc.], but not of the articles of faith, diminish the measure of faith, since they make the thing believed to be seen, yet they do not diminish the measure of charity, which makes the will ready to believe them, even if they were unseen; and so the measure of merit is not diminished.

Whether this is a fitting definition of faith: "Faith is the substance of things to be hoped for, the evidence of things that appear not?"

Objection 1. It would seem that the Apostle gives an unfitting definition of faith (Heb. 11:1) when he says: "Faith is the substance of things to be hoped for, the evidence of things that appear not." For no quality is a substance: whereas faith is a quality, since it is a theological virtue, as stated above (I-II, 62, 3). Therefore it is not a substance.

Objection 2. Further, different virtues have different objects. Now things to be hoped for are the object of hope. Therefore they should not be included in a definition of faith, as though they were its object.

Objection 5. Further, evidence manifests the truth of the matter for which it is adduced. Now a thing is said to be apparent when its truth is already manifest. Therefore it seems to imply a contradiction to speak of "evidence of things that appear not": and so faith is unfittingly defined.

On the contrary, The authority of the Apostle suffices.

I answer that, Though some say that the above words of the Apostle are not a definition of faith, yet if we consider the matter aright, this definition overlooks none of the points in reference to which faith can be defined, albeit the words themselves are not arranged in the form of a definition, just as the philosophers touch on the principles of the syllogism, without employing the syllogistic form.

In order to make this clear, we must observe that since habits are known by their acts, and acts by their objects, faith, being a habit, should be defined by its proper act in relation to its proper object. Now the act of faith is to believe, as stated above (2, 2,3), which is an act of the intellect determinate to one object of the will's command. Hence an act of faith is related both to the object of the will, i.e. to the good and the end, and to the object of the intellect, i.e. to the true. And since faith, through being a theological virtues, as stated above (I-II, 62, 2), has one same thing for object and end, its object and end must, of necessity, be in proportion to one another. Now it has been already stated (1, 1,4) that the object of faith is the First Truth, as unseen, and whatever we hold on account thereof: so that it must needs be under the aspect of something unseen that the First Truth is the end of the act of faith, which aspect is that of a thing hoped for, according to the Apostle (Rm. 8:25): "We hope for that which we see not": because to see the truth is to possess it. Now one hopes not for what one has already, but for what one has not, as stated above (I-II, 67, 4). Accordingly the relation of the act of faith to its end which is the object of the will, is indicated by the words: "Faith is the substance of things to be hoped for." For we are wont to call by the name of substance, the first beginning of a thing, especially when the whole subsequent thing is virtually contained in the first beginning; for instance, we might say that the first self-evident principles are the substance of science, because, to wit, these principles are in us the first beginnings of science, the whole of which is itself contained in them virtually. On this way then faith is said to be the "substance of things to be hoped for," for the reason that in us the first beginning of things to be hoped for is brought about by the assent of faith, which contains virtually all things to be hoped for. Because we hope to be made happy through seeing the unveiled truth to which our faith cleaves, as was made evident when we were speaking of happiness (I-II, 3, 8; I-II, 4, 3).

The relationship of the act of faith to the object of the intellect, considered as the object of faith, is indicated by the words, "evidence of things that appear not," where "evidence" is taken for the result of evidence. For evidence induces the intellect to adhere to a truth, wherefore the firm adhesion of the intellect to the non-apparent truth of faith is called "evidence" here. Hence another reading has "conviction," because to wit, the intellect of the believer is convinced by Divine authority, so as to assent to what it sees not. Accordingly if anyone would reduce the foregoing words to the form of a definition, he may say that "faith is a habit of the mind, whereby eternal life is begun in us, making the intellect assent to what is non-apparent."

In this way faith is distinguished from all other things pertaining to the intellect. For when we describe it as "evidence," we distinguish it from opinion, suspicion, and doubt, which do not make the intellect adhere to anything firmly; when we go on to say, "of things that appear not," we distinguish it from science and understanding, the object of which is something apparent; and when we say that it is "the substance of things to be hoped for," we distinguish the virtue of faith from faith commonly so called, which has no reference to the beatitude we hope for.

Whatever other definitions are given of faith, are explanations of this one given by the Apostle. For when Augustine says (Tract. xl in Joan.: QQ. Evang. ii, qu. 39) that "faith is a virtue whereby we believe what we do not see," and when Damascene says (De Fide Orth. iv, 11) that "faith is an assent without research," and when others say that "faith is that certainty of the mind about absent things which surpasses opinion but falls short of science," these all amount to the same as the Apostle's words: "Evidence of things that appear not"; and when Dionysius says (Div. Nom. vii) that "faith is the solid foundation of the believer, establishing him in the truth, and showing forth the truth in him," comes to the same as "substance of things to be hoped for."

Reply to Objection 1. "Substance" here does not stand for the supreme genus condivided with the other genera, but for that likeness to substance which is found in each genus, inasmuch as the first thing in a genus contains the others virtually and is said to be the substance thereof.

Reply to Objection 2. Since faith pertains to the intellect as commanded by the will, it must needs be directed, as to its end, to the objects of those virtues which perfect the will, among which is hope, as we shall prove further on (18, 1). For this reason the definition of faith includes the object of hope.

Reply to Objection 5. Evidence taken from the proper principles of a thing, make it apparent, whereas evidence taken from Divine authority does not make a thing apparent in itself, and such is the evidence referred to in the definition of faith.

q. 6, a. 1, Whether faith is infused into man by God?

On the contrary, It is written (Eph. 2:8,9): "By grace you are saved through faith, and that not of yourselves . . . that no man may glory . . . for it is the gift of God."

I answer that, Two things are requisite for faith. First, that the things which are of faith should be proposed to man: this is necessary in order that man believe anything explicitly. The second thing requisite for faith is the assent of the believer to the things which are proposed to him. Accordingly, as regards the first of these, faith must needs be from God. Because those things which are of faith surpass human reason, hence they do not come to man's knowledge, unless God reveal them. To some, indeed, they are revealed by God immediately, as those things which were revealed to the apostles and prophets, while to some they are proposed by God in sending preachers of the faith, according to Rm. 10:15: "How shall they preach, unless they be sent?"

As regards the second, viz. man's assent to the things which are of faith, we may observe a twofold cause, one of external inducement, such as seeing a miracle, or being persuaded by someone to embrace the faith: neither of which is a sufficient cause, since of those who see the same miracle, or who hear the same sermon, some believe, and some do not. Hence we must assert another internal cause, which moves man inwardly to assent to matters of faith.

The Pelagians held that this cause was nothing else than man's free-will: and consequently they said that the beginning of faith is from ourselves, inasmuch as, to wit, it is in our power to be ready to assent to things which are of faith, but that the consummation of faith is from God, Who proposes to us the things we have to believe. But this is false, for, since man, by assenting to matters of faith, is raised above his nature, this must needs accrue to him from some supernatural principle moving him inwardly; and this is God. Therefore faith, as regards the assent which is the chief act of faith, is from God moving man inwardly by grace.