Thomas Aquinas - Summa Theologica, Part III (Tertia Pars)

Reply Obj. 1: Arius and Eunomius understood this saying, not of the knowledge of the soul, which they did not hold to be in Christ, as was said above (Q. 9, A. 1), but of the Divine knowledge of the Son, Whom they held to be less than the Father as regards knowledge. But this will not stand, since all things were made by the Word of God, as is said John 1:3, and, amongst other things, all times were made by Him. Now He is not ignorant of anything that was made by Him.

He is said, therefore, not to know the day and the hour of the Judgment, for that He does not make it known, since, on being asked by the apostles (Acts 1:7), He was unwilling to reveal it; and, on the contrary, we read (Gen. 22:12): "Now I know that thou fearest God," i.e. "Now I have made thee know." But the Father is said to know, because He imparted this knowledge to the Son. Hence, by saying "but the Father," we are given to understand that the Son knows, not merely in the Divine Nature, but also in the human, because, as Chrysostom argues (Hom. lxxviii in Matth.), if it is given to Christ as man to know how to judge—which is greater—much more is it given to Him to know the less, viz. the time of Judgment. Origen, however (in Matth. Tract. xxx), expounds it of His body, which is the Church, which is ignorant of this time. Lastly, some say this is to be understood of the adoptive, and not of the natural Son of God.

Reply Obj. 2: God knows His Essence so much the more perfectly than the soul of Christ, as He comprehends it. And hence He knows all things, not merely whatever are in act at any time, which things He is said to know by knowledge of vision, but also what ever He Himself can do, which He is said to know by simple intelligence, as was shown in the First Part (Q. 14, A. 9). Therefore the soul of Christ knows all things that God knows in Himself by the knowledge of vision, but not all that God knows in Himself by knowledge of simple intelligence; and thus in Himself God knows many more things than the soul of Christ.

Reply Obj. 3: The extent of knowledge depends not merely on the number of knowable things, but also on the clearness of the knowledge. Therefore, although the knowledge of the soul of Christ which He has in the Word is equal to the knowledge of vision as regards the number of things known, nevertheless the knowledge of God infinitely exceeds the knowledge of the soul of Christ in clearness of cognition, since the uncreated light of the Divine intellect infinitely exceeds any created light received by the soul of Christ; although, absolutely speaking, the Divine knowledge exceeds the knowledge of the soul of Christ, not only as regards the mode of knowing, but also as regards the number of things known, as was stated above. _______________________

THIRD ARTICLE [III, Q. 10, Art. 3]

Whether the Soul of Christ Can Know the Infinite in the Word?

Objection 1: It would seem that the soul of Christ cannot know the infinite in the Word. For that the infinite should be known is repugnant to the definition of the infinite which (Phys. iii, 63) is said to be that "from which, however much we may take, there always remains something to be taken." But it is impossible for the definition to be separated from the thing defined, since this would mean that contradictories exist together. Therefore it is impossible that the soul of Christ knows the infinite.

Obj. 2: Further, the knowledge of the infinite is infinite. But the knowledge of the soul of Christ cannot be infinite, because its capacity is finite, since it is created. Therefore the soul of Christ cannot know the infinite.

Obj. 3: Further, there can be nothing greater than the infinite. But more is contained in the Divine knowledge, absolutely speaking, than in the knowledge of Christ's soul, as stated above (A. 2). Therefore the soul of Christ does not know the infinite.

On the contrary, The soul of Christ knows all its power and all it can do. Now it can cleanse infinite sins, according to 1 John 2:2: "He is the propitiation for our sins, and not for ours only, but also for those of the whole world." Therefore the soul of Christ knows the infinite.

I answer that, Knowledge regards only being, since being and truth are convertible. Now a thing is said to be a being in two ways: First, simply, i.e. whatever is a being in act; secondly, relatively, i.e. whatever is a being in potentiality. And because, as is said Metaph. ix, 20, everything is known as it is in act, and not as it is in potentiality, knowledge primarily and essentially regards being in act, and secondarily regards being in potentiality, which is not knowable of itself, but inasmuch as that in whose power it exists is known. Hence, with regard to the first mode of knowledge, the soul of Christ does not know the infinite. Because there is not an infinite number in act, even though we were to reckon all that are in act at any time whatsoever, since the state of generation and corruption will not last for ever: consequently there is a certain number not only of things lacking generation and corruption, but also of things capable of generation and corruption. But with regard to the other mode of knowing, the soul of Christ knows infinite things in the Word, for it knows, as stated above (A. 2), all that is in the power of the creature. Hence, since in the power of the creature there is an infinite number of things, it knows the infinite, as it were, by a certain knowledge of simple intelligence, and not by a knowledge of vision.

Reply Obj. 1: As we said in the First Part (Q. 8, A. 1), the infinite is taken in two ways. First, on the part of a form, and thus we have the negatively infinite, i.e. a form or act not limited by being received into matter or a subject; and this infinite of itself is most knowable on account of the perfection of the act, although it is not comprehensible by the finite power of the creature; for thus God is said to be infinite. And this infinite the soul of Christ knows, yet does not comprehend. Secondly, there is the infinite as regards matter, which is taken privatively, i.e. inasmuch as it has not the form it ought naturally to have, and in this way we have infinite in quantity. Now such an infinite of itself, is unknown: inasmuch as it is, as it were, matter with privation of form as is said Phys. iii, 65. But all knowledge is by form or act. Therefore if this infinite is to be known according to its mode of being, it cannot be known. For its mode is that part be taken after part, as is said Phys. iii, 62, 63. And in this way it is true that, if we take something from it, i.e. taking part after part, there always remains something to be taken. But as material things can be received by the intellect immaterially, and many things unitedly, so can infinite things be received by the intellect, not after the manner of infinite, but finitely; and thus what are in themselves infinite are, in the intellect of the knower, finite. And in this way the soul of Christ knows an infinite number of things, inasmuch as it knows them not by discoursing from one to another, but in a certain unity, i.e. in any creature in whose potentiality infinite things exist, and principally in the Word Himself.

Reply Obj. 2: There is nothing to hinder a thing from being infinite in one way and finite in another, as when in quantities we imagine a surface infinite in length and finite in breadth. Hence, if there were an infinite number of men, they would have a relative infinity, i.e. in multitude; but, as regards the essence, they would be finite, since the essence of all would be limited to one specific nature. But what is simply infinite in its essence is God, as was said in the First Part (Q. 7, A. 2). Now the proper object of the intellect is "what a thing is," as is said De Anima iii, 26, to which pertains the notion of the species. And thus the soul of Christ, since it has a finite capacity, attains to, but does not comprehend, what is simply infinite in essence, as stated above (A. 1). But the infinite in potentiality which is in creatures can be comprehended by the soul of Christ, since it is compared to that soul according to its essence, in which respect it is not infinite. For even our intellect understands a universal—for example, the nature of a genus or species, which in a manner has infinity, inasmuch as it can be predicated of an infinite number.