Summa Theologica Part I (Prima Pars) Part 112

Objection 1: It would seem that the soul is composed of matter and form. For potentiality is opposed to actuality. Now, whatsoever things are in actuality partic.i.p.ate of the First Act, which is G.o.d; by partic.i.p.ation of Whom, all things are good, are beings, and are living things, as is clear from the teaching of Dionysius (Div. Nom.

v). Therefore whatsoever things are in potentiality partic.i.p.ate of the first potentiality. But the first potentiality is primary matter.

Therefore, since the human soul is, after a manner, in potentiality; which appears from the fact that sometimes a man is potentially understanding; it seems that the human soul must partic.i.p.ate of primary matter, as part of itself.

Obj. 2: Further, wherever the properties of matter are found, there matter is. But the properties of matter are found in the soul--namely, to be a subject, and to be changed, for it is a subject to science, and virtue; and it changes from ignorance to knowledge and from vice to virtue. Therefore matter is in the soul.

Obj. 3: Further, things which have no matter, have no cause of their existence, as the Philosopher says _Metaph._ viii (Did. vii, 6). But the soul has a cause of its existence, since it is created by G.o.d.

Therefore the soul has matter.

Obj. 4: Further, what has no matter, and is a form only, is a pure act, and is infinite. But this belongs to G.o.d alone. Therefore the soul has matter.

_On the contrary,_ Augustine (Gen. ad lit. vii, 7,8,9) proves that the soul was made neither of corporeal matter, nor of spiritual matter.

_I answer that,_ The soul has no matter. We may consider this question in two ways. First, from the notion of a soul in general; for it belongs to the notion of a soul to be the form of a body. Now, either it is a form by virtue of itself, in its entirety, or by virtue of some part of itself. If by virtue of itself in its entirety, then it is impossible that any part of it should be matter, if by matter we understand something purely potential: for a form, as such, is an act; and that which is purely potentiality cannot be part of an act, since potentiality is repugnant to actuality as being opposite thereto. If, however, it be a form by virtue of a part of itself, then we call that part the soul: and that matter, which it actualizes first, we call the "primary animate."

Secondly, we may proceed from the specific notion of the human soul inasmuch as it is intellectual. For it is clear that whatever is received into something is received according to the condition of the recipient. Now a thing is known in as far as its form is in the knower. But the intellectual soul knows a thing in its nature absolutely: for instance, it knows a stone absolutely as a stone; and therefore the form of a stone absolutely, as to its proper formal idea, is in the intellectual soul. Therefore the intellectual soul itself is an absolute form, and not something composed of matter and form. For if the intellectual soul were composed of matter and form, the forms of things would be received into it as individuals, and so it would only know the individual: just as it happens with the sensitive powers which receive forms in a corporeal organ; since matter is the principle by which forms are individualized. It follows, therefore, that the intellectual soul, and every intellectual substance which has knowledge of forms absolutely, is exempt from composition of matter and form.

Reply Obj. 1: The First Act is the universal principle of all acts; because It is infinite, virtually "precontaining all things," as Dionysius says (Div. Nom. v). Wherefore things partic.i.p.ate of It not as a part of themselves, but by diffusion of Its processions. Now as potentiality is receptive of act, it must be proportionate to act.

But the acts received which proceed from the First Infinite Act, and are partic.i.p.ations thereof, are diverse, so that there cannot be one potentiality which receives all acts, as there is one act, from which all partic.i.p.ated acts are derived; for then the receptive potentiality would equal the active potentiality of the First Act.

Now the receptive potentiality in the intellectual soul is other than the receptive potentiality of first matter, as appears from the diversity of the things received by each. For primary matter receives individual forms; whereas the intelligence receives absolute forms.

Hence the existence of such a potentiality in the intellectual soul does not prove that the soul is composed of matter and form.

Reply Obj. 2: To be a subject and to be changed belong to matter by reason of its being in potentiality. As, therefore, the potentiality of the intelligence is one thing and the potentiality of primary matter another, so in each is there a different reason of subjection and change. For the intelligence is subject to knowledge, and is changed from ignorance to knowledge, by reason of its being in potentiality with regard to the intelligible species.

Reply Obj. 3: The form causes matter to be, and so does the agent; wherefore the agent causes matter to be, so far as it actualizes it by trans.m.u.ting it to the act of a form. A subsistent form, however, does not owe its existence to some formal principle, nor has it a cause trans.m.u.ting it from potentiality to act. So after the words quoted above, the Philosopher concludes, that in things composed of matter and form "there is no other cause but that which moves from potentiality to act; while whatsoever things have no matter are simply beings at once." [*The Leonine edition has, "simpliciter sunt quod vere entia aliquid." The Parma edition of St. Thomas's Commentary on Aristotle has, "statim per se unum quiddam est ...

et ens quiddam."]

Reply Obj. 4: Everything partic.i.p.ated is compared to the partic.i.p.ator as its act. But whatever created form be supposed to subsist "per se," must have existence by partic.i.p.ation; for "even life," or anything of that sort, "is a partic.i.p.ator of existence," as Dionysius says (Div. Nom. v). Now partic.i.p.ated existence is limited by the capacity of the partic.i.p.ator; so that G.o.d alone, Who is His own existence, is pure act and infinite. But in intellectual substances there is composition of actuality and potentiality, not, indeed, of matter and form, but of form and partic.i.p.ated existence. Wherefore some say that they are composed of that "whereby they are" and that "which they are"; for existence itself is that by which a thing is.

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SIXTH ARTICLE [I, Q. 75, Art. 6]

Whether the Human Soul Is Incorruptible?

Objection 1: It would seem that the human soul is corruptible. For those things that have a like beginning and process seemingly have a like end. But the beginning, by generation, of men is like that of animals, for they are made from the earth. And the process of life is alike in both; because "all things breathe alike, and man hath nothing more than the beast," as it is written (Eccles. 3:19). Therefore, as the same text concludes, "the death of man and beast is one, and the condition of both is equal." But the souls of brute animals are corruptible. Therefore, also, the human soul is corruptible.

Obj. 2: Further, whatever is out of nothing can return to nothingness; because the end should correspond to the beginning. But as it is written (Wis. 2:2), "We are born of nothing"; which is true, not only of the body, but also of the soul. Therefore, as is concluded in the same pa.s.sage, "After this we shall be as if we had not been," even as to our soul.

Obj. 3: Further, nothing is without its own proper operation. But the operation proper to the soul, which is to understand through a phantasm, cannot be without the body. For the soul understands nothing without a phantasm; and there is no phantasm without the body as the Philosopher says (De Anima i, 1). Therefore the soul cannot survive the dissolution of the body.

_On the contrary,_ Dionysius says (Div. Nom. iv) that human souls owe to Divine goodness that they are "intellectual," and that they have "an incorruptible substantial life."

_I answer that,_ We must a.s.sert that the intellectual principle which we call the human soul is incorruptible. For a thing may be corrupted in two ways--_per se,_ and accidentally. Now it is impossible for any substance to be generated or corrupted accidentally, that is, by the generation or corruption of something else. For generation and corruption belong to a thing, just as existence belongs to it, which is acquired by generation and lost by corruption. Therefore, whatever has existence _per se_ cannot be generated or corrupted except "per se"; while things which do not subsist, such as accidents and material forms, acquire existence or lose it through the generation or corruption of composite things. Now it was shown above (AA. 2, 3) that the souls of brutes are not self-subsistent, whereas the human soul is; so that the souls of brutes are corrupted, when their bodies are corrupted; while the human soul could not be corrupted unless it were corrupted _per se._ This, indeed, is impossible, not only as regards the human soul, but also as regards anything subsistent that is a form alone. For it is clear that what belongs to a thing by virtue of itself is inseparable from it; but existence belongs to a form, which is an act, by virtue of itself. Wherefore matter acquires actual existence as it acquires the form; while it is corrupted so far as the form is separated from it. But it is impossible for a form to be separated from itself; and therefore it is impossible for a subsistent form to cease to exist.

Granted even that the soul is composed of matter and form, as some pretend, we should nevertheless have to maintain that it is incorruptible. For corruption is found only where there is contrariety; since generation and corruption are from contraries and into contraries. Wherefore the heavenly bodies, since they have no matter subject to contrariety, are incorruptible. Now there can be no contrariety in the intellectual soul; for it receives according to the manner of its existence, and those things which it receives are without contrariety; for the notions even of contraries are not themselves contrary, since contraries belong to the same knowledge.

Therefore it is impossible for the intellectual soul to be corruptible. Moreover we may take a sign of this from the fact that everything naturally aspires to existence after its own manner. Now, in things that have knowledge, desire ensues upon knowledge. The senses indeed do not know existence, except under the conditions of "here" and "now," whereas the intellect apprehends existence absolutely, and for all time; so that everything that has an intellect naturally desires always to exist. But a natural desire cannot be in vain. Therefore every intellectual substance is incorruptible.

Reply Obj. 1: Solomon reasons thus in the person of the foolish, as expressed in the words of Wisdom 2. Therefore the saying that man and animals have a like beginning in generation is true of the body; for all animals alike are made of earth. But it is not true of the soul.

For the souls of brutes are produced by some power of the body; whereas the human soul is produced by G.o.d. To signify this it is written as to other animals: "Let the earth bring forth the living soul" (Gen. 1:24): while of man it is written (Gen. 2:7) that "He breathed into his face the breath of life." And so in the last chapter of Ecclesiastes (12:7) it is concluded: "(Before) the dust return into its earth from whence it was; and the spirit return to G.o.d Who gave it." Again the process of life is alike as to the body, concerning which it is written (Eccles. 3:19): "All things breathe alike," and (Wis. 2:2), "The breath in our nostrils is smoke." But the process is not alike of the soul; for man is intelligent, whereas animals are not. Hence it is false to say: "Man has nothing more than beasts." Thus death comes to both alike as to the body, by not as to the soul.

Reply Obj. 2: As a thing can be created by reason, not of a pa.s.sive potentiality, but only of the active potentiality of the Creator, Who can produce something out of nothing, so when we say that a thing can be reduced to nothing, we do not imply in the creature a potentiality to non-existence, but in the Creator the power of ceasing to sustain existence. But a thing is said to be corruptible because there is in it a potentiality to non-existence.

Reply Obj. 3: To understand through a phantasm is the proper operation of the soul by virtue of its union with the body. After separation from the body it will have another mode of understanding, similar to other substances separated from bodies, as will appear later on (Q. 89, A. 1).

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SEVENTH ARTICLE [I, Q. 75, Art. 7]

Whether the Soul Is of the Same Species As an Angel?

Objection 1: It would seem that the soul is of the same species as an angel. For each thing is ordained to its proper end by the nature of its species, whence is derived its inclination for that end. But the end of the soul is the same as that of an angel--namely, eternal happiness. Therefore they are of the same species.

Obj. 2: Further, the ultimate specific difference is the n.o.blest, because it completes the nature of the species. But there is nothing n.o.bler either in an angel or in the soul than their intellectual nature. Therefore the soul and the angel agree in the ultimate specific difference: therefore they belong to the same species.

Obj. 3: Further, it seems that the soul does not differ from an angel except in its union with the body. But as the body is outside the essence of the soul, it seems that it does not belong to its species.

Therefore the soul and angel are of the same species.

_On the contrary,_ Things which have different natural operations are of different species. But the natural operations of the soul and of an angel are different; since, as Dionysius says (Div. Nom. vii), "Angelic minds have simple and blessed intelligence, not gathering their knowledge of Divine things from visible things." Subsequently he says the contrary to this of the soul. Therefore the soul and an angel are not of the same species.

_I answer that,_ Origen (Peri Archon iii, 5) held that human souls and angels are all of the same species; and this because he supposed that in these substances the difference of degree was accidental, as resulting from their free-will: as we have seen above (Q. 47, A. 2).

But this cannot be; for in incorporeal substances there cannot be diversity of number without diversity of species and inequality of nature; because, as they are not composed of matter and form, but are subsistent forms, it is clear that there is necessarily among them a diversity of species. For a separate form cannot be understood otherwise than as one of a single species; thus, supposing a separate whiteness to exist, it could only be one; forasmuch as one whiteness does not differ from another except as in this or that subject. But diversity of species is always accompanied with a diversity of nature; thus in species of colors one is more perfect than another; and the same applies to other species, because differences which divide a genus are contrary to one another. Contraries, however, are compared to one another as the perfect to the imperfect, since the "principle of contrariety is habit, and privation thereof," as is written, _Metaph._ x (Did. ix, 4). The same would follow if the aforesaid substances were composed of matter and form. For if the matter of one be distinct from the matter of another, it follows that either the form is the principle of the distinction of matter--that is to say, that the matter is distinct on account of its relation to divers forms; and even then there would result a difference of species and inequality of nature: or else the matter is the principle of the distinction of forms. But one matter cannot be distinct from another, except by a distinction of quant.i.ty, which has no place in these incorporeal substances, such as an angel and the soul. So that it is not possible for the angel and the soul to be of the same species. How it is that there can be many souls of one species will be explained later (Q. 76, A. 2, ad 1).

Reply Obj. 1: This argument proceeds from the proximate and natural end. Eternal happiness is the ultimate and supernatural end.

Reply Obj. 2: The ultimate specific difference is the n.o.blest because it is the most determinate, in the same way as actuality is n.o.bler than potentiality. Thus, however, the intellectual faculty is not the n.o.blest, because it is indeterminate and common to many degrees of intellectuality; as the sensible faculty is common to many degrees in the sensible nature. Hence, as all sensible things are not of one species, so neither are all intellectual things of one species.

Reply Obj. 3: The body is not of the essence of the soul; but the soul by the nature of its essence can be united to the body, so that, properly speaking, not the soul alone, but the "composite," is the species. And the very fact that the soul in a certain way requires the body for its operation, proves that the soul is endowed with a grade of intellectuality inferior to that of an angel, who is not united to a body.

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QUESTION 76

OF THE UNION OF BODY AND SOUL (In Eight Articles)

We now consider the union of the soul with the body; and concerning this there are eight points of inquiry:

(1) Whether the intellectual principle is united to the body as its form?

(2) Whether the intellectual principle is multiplied numerically according to the number of bodies; or is there one intelligence for all men?

(3) Whether in the body the form of which is an intellectual principle, there is some other soul?

(4) Whether in the body there is any other substantial form?

(5) Of the qualities required in the body of which the intellectual principle is the form?

(6) Whether it be united to such a body by means of another body?

(7) Whether by means of an accident?

(8) Whether the soul is wholly in each part of the body?

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