OF THE ACQUIRED OR EMPIRIC KNOWLEDGE OF CHRIST'S SOUL (FOUR ARTICLES)
We must now consider the acquired or empiric knowledge of Christ's soul; and under this head there are four points of inquiry:
(1) Whether Christ knew all things by this knowledge?
(2) Whether He advanced in this knowledge?
(3) Whether He learned anything from man?
(4) Whether He received anything from angels?
Whether Christ knew all things by this acquired or empiric knowledge?
Objection 1: It would seem that Christ did not know everything by this knowledge. For this knowledge is acquired by experience. But Christ did not experience everything. Therefore He did not know everything by this knowledge.
Objection 2: Further, man acquires knowledge through the senses. But not all sensible things were subjected to Christ's bodily senses. Therefore Christ did not know everything by this knowledge.
Objection 3: Further, the extent of knowledge depends on the things knowable. Therefore if Christ knew all things by this knowledge, His acquired knowledge would have been equal to His infused and beatific knowledge; which is not fitting. Therefore Christ did not know all things by this knowledge.
On the contrary, Nothing imperfect was in Christ's soul. Now this knowledge of His would have been imperfect if He had not known all things by it, since the imperfect is that to which addition may be made. Hence Christ knew all things by this knowledge.
I answer that, Acquired knowledge is held to be in Christ's soul, as we have said Q[9], A[4], by reason of the active intellect, lest its action, which is to make things actually intelligible, should be wanting; even as imprinted or infused knowledge is held to be in Christ's soul for the perfection of the passive intellect. Now as the passive intellect is that by which "all things are in potentiality," so the active intellect is that by which "all are in act," as is said De Anima iii, 18. And hence, as the soul of Christ knew by infused knowledge all things to which the passive intellect is in any way in potentiality, so by acquired knowledge it knew whatever can be known by the action of the active intellect.
Reply to Objection 1: The knowledge of things may be acquired not merely by experiencing the things themselves, but by experiencing other things; since by virtue of the light of the active intellect man can go on to understand effects from causes, and causes from effects, like from like, contrary from contrary. Therefore Christ, though He did not experience all things, came to the knowledge of all things from what He did experience.
Reply to Objection 2: Although all sensible things were not subjected to Christ's bodily senses, yet other sensible things were subjected to His senses; and from this He could come to know other things by the most excellent force of His reason, in the manner described in the previous reply; just as in seeing heavenly bodies He could comprehend their powers and the effects they have upon things here below, which were not subjected to His senses; and for the same reason, from any other things whatsoever, He could come to the knowledge of yet other things.
Reply to Objection 3: By this knowledge the soul of Christ did not know all things simply, but all such as are knowable by the light of man's active intellect. Hence by this knowledge He did not know the essences of separate substances, nor past, present, or future singulars, which, nevertheless, He knew by infused knowledge, as was said above (Q[11]).
Whether Christ advanced in acquired or empiric knowledge?
Objection 1: It would seem that Christ did not advance in this knowledge. For even as Christ knew all things by His beatific and His infused knowledge, so also did He by this acquired knowledge, as is plain from what has been said (A[1]). But He did not advance in these knowledges. Therefore neither in this.
Objection 2: Further, to advance belongs to the imperfect, since the perfect cannot be added to. Now we cannot suppose an imperfect knowledge in Christ. Therefore Christ did not advance in this knowledge.
Objection 3: Further, Damascene says (De Fide Orth. iii, 22): "Whoever say that Christ advanced in wisdom and grace, as if receiving additional sensations, do not venerate the union which is in hypostasis." But it is impious not to venerate this union. Therefore it is impious to say that His knowledge received increase.
On the contrary, It is written ( Lk. 2:52 ): "Jesus advanced in wisdom and age and grace with God and men"; and Ambrose says (De Incar. Dom. vii) that "He advanced in human wisdom." Now human wisdom is that which is acquired in a human manner, i.e. by the light of the active intellect. Therefore Christ advanced in this knowledge.
I answer that, There is a twofold advancement in knowledge: one in essence, inasmuch as the habit of knowledge is increased; the other in effect---e.g. if someone were with one and the same habit of knowledge to prove to someone else some minor truths at first, and afterwards greater and more subtle conclusions. Now in this second way it is plain that Christ advanced in knowledge and grace, even as in age, since as His age increased He wrought greater deeds, and showed greater knowledge and grace.
But as regards the habit of knowledge, it is plain that His habit of infused knowledge did not increase, since from the beginning He had perfect infused knowledge of all things; and still less could His beatific knowledge increase; while in the FP, Q[14], A[15], we have already said that His Divine knowledge could not increase. Therefore, if in the soul of Christ there was no habit of acquired knowledge, beyond the habit of infused knowledge, as appears to some [*Blessed Albert the Great, Alexander of Hales, St. Bonaventure], and sometime appeared to me (Sent. iii, D, xiv), no knowledge in Christ increased in essence, but merely by experience, i.e. by comparing the infused intelligible species with phantasms. And in this way they maintain that Christ's knowledge grew in experience, e.g. by comparing the infused intelligible species with what He received through the senses for the first time. But because it seems unfitting that any natural intelligible action should be wanting to Christ, and because to extract intelligible species from phantasms is a natural action of man's active intellect, it seems becoming to place even this action in Christ. And it follows from this that in the soul of Christ there was a habit of knowledge which could increase by this abstraction of species; inasmuch as the active intellect, after abstracting the first intelligible species from phantasms, could abstract others, and others again.
Reply to Objection 1: Both the infused knowledge and the beatific knowledge of Christ's soul were the effects of an agent of infinite power, which could produce the whole at once; and thus in neither knowledge did Christ advance; since from the beginning He had them perfectly. But the acquired knowledge of Christ is caused by the active intellect which does not produce the whole at once, but successively; and hence by this knowledge Christ did not know everything from the beginning, but step by step, and after a time, i.e. in His perfect age; and this is plain from what the Evangelist says, viz. that He increased in "knowledge and age" together.
Reply to Objection 2: Even this knowledge was always perfect for the time being, although it was not always perfect, simply and in comparison to the nature; hence it could increase.
Reply to Objection 3: This saying of Damascene regards those who say absolutely that addition was made to Christ's knowledge, i.e. as regards any knowledge of His, and especially as regards the infused knowledge which is caused in Christ's soul by union with the Word; but it does not regard the increase of knowledge caused by the natural agent.