Part I (Prima Pars) Part 135 (1/2)

Reply Obj. 1: The object of the intellect is something universal, namely, _being_ and _the true,_ in which the act also of understanding is comprised. Wherefore the intellect can understand its own act. But not primarily, since the first object of our intellect, in this state of life, is not every being and everything true, but _being_ and _true,_ as considered in material things, as we have said above (Q. 84, A. 7), from which it acquires knowledge of all other things.

Reply Obj. 2: The intelligent act of the human intellect is not the act and perfection of the material nature understood, as if the nature of the material thing and intelligent act could be understood by one act; just as a thing and its perfection are understood by one act. Hence the act whereby the intellect understands a stone is distinct from the act whereby it understands that it understands a stone; and so on. Nor is there any difficulty in the intellect being thus potentially infinite, as explained above (Q. 86, A. 2).

Reply Obj. 3: The proper sense feels by reason of the immutation in the material organ caused by the external sensible. A material object, however, cannot immute itself; but one is immuted by another, and therefore the act of the proper sense is perceived by the common sense. The intellect, on the contrary, does not perform the act of understanding by the material immutation of an organ; and so there is no comparison.

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FOURTH ARTICLE [I, Q. 87, Art. 4]

Whether the Intellect Understands the Act of the Will?

Objection 1: It would seem that the intellect does not understand the act of the will. For nothing is known by the intellect, unless it be in some way present in the intellect. But the act of the will is not in the intellect; since the will and the intellect are distinct.

Therefore the act of the will is not known by the intellect.

Obj. 2: Further, the act is specified by the object. But the object of the will is not the same as the object of the intellect. Therefore the act of the will is specifically distinct from the object of the intellect, and therefore the act of the will is not known by the intellect.

Obj. 3: Augustine (Confess. x, 17) says of the soul's affections that ”they are known neither by images as bodies are known; nor by their presence, like the arts; but by certain notions.” Now it does not seem that there can be in the soul any other notions of things but either the essences of things known or the likenesses thereof.

Therefore it seems impossible for the intellect to known such affections of the soul as the acts of the will.

_On the contrary,_ Augustine says (De Trin. x, 11), ”I understand that I will.”

_I answer that,_ As stated above (Q. 59, A. 1), the act of the will is nothing but an inclination consequent on the form understood; just as the natural appet.i.te is an inclination consequent on the natural form. Now the inclination of a thing resides in it according to its mode of existence; and hence the natural inclination resides in a natural thing naturally, and the inclination called the sensible appet.i.te is in the sensible thing sensibly; and likewise the intelligible inclination, which is the act of the will, is in the intelligent subject intelligibly as in its principle and proper subject. Hence the Philosopher expresses himself thus (De Anima iii, 9)--that ”the will is in the reason.” Now whatever is intelligibly in an intelligent subject, is understood by that subject. Therefore the act of the will is understood by the intellect, both inasmuch as one knows that one wills; and inasmuch as one knows the nature of this act, and consequently, the nature of its principle which is the habit or power.

Reply Obj. 1: This argument would hold good if the will and the intellect were in different subjects, as they are distinct powers; for then whatever was in the will would not be in the intellect. But as both are rooted in the same substance of the soul, and since one is in a certain way the principle of the other, consequently what is in the will is, in a certain way, also in the intellect.

Reply Obj. 2: The ”good” and the ”true” which are the objects of the will and of the intellect, differ logically, but one is contained in the other, as we have said above (Q. 82, A. 4, ad 1; Q. 16, A. 4, ad 1); for the true is good and the good is true. Therefore the objects of the will fall under the intellect, and those of the intellect can fall under the will.

Reply Obj. 3: The affections of the soul are in the intellect not by similitude only, like bodies; nor by being present in their subject, as the arts; but as the thing caused is in its principle, which contains some notion of the thing caused. And so Augustine says that the soul's affections are in the memory by certain notions.

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QUESTION 88

HOW THE HUMAN SOUL KNOWS WHAT IS ABOVE ITSELF (In Three Articles)

We must now consider how the human soul knows what is above itself, viz. immaterial substances. Under this head there are three points of inquiry:

(1) Whether the human soul in the present state of life can understand the immaterial substances called angels, in themselves?

(2) Whether it can arrive at the knowledge thereof by the knowledge of material things?

(3) Whether G.o.d is the first object of our knowledge?

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FIRST ARTICLE [I, Q. 88, Art. 1]

Whether the Human Soul in the Present State of Life Can Understand Immaterial Substances in Themselves?

Objection 1: It would seem that the human soul in the present state of life can understand immaterial substances in themselves. For Augustine (De Trin. ix, 3) says: ”As the mind itself acquires the knowledge of corporeal things by means of the corporeal senses, so it gains from itself the knowledge of incorporeal things.” But these are the immaterial substances. Therefore the human mind understands immaterial substances.

Obj. 2: Further, like is known by like. But the human mind is more akin to immaterial than to material things; since its own nature is immaterial, as is clear from what we have said above (Q. 76, A. 1).

Since then our mind understands material things, much more is it able to understand immaterial things.

Obj. 3: Further, the fact that objects which are in themselves most sensible are not most felt by us, comes from sense being corrupted by their very excellence. But the intellect is not subject to such a corrupting influence from its object, as is stated _De Anima_ iii, 4.