Part II (Pars Prima Secundae) Part 29 (1/2)

EIGHTH ARTICLE [I-II, Q. 17, Art. 8]

Whether the Act of the Vegetal Soul Is Commanded?

Objection 1: It would seem that the acts of the vegetal soul are subject to the command of reason. For the sensitive powers are of higher rank than the vegetal powers. But the powers of the sensitive soul are subject to the command of reason. Much more, therefore, are the powers of the vegetal soul.

Obj. 2: Further, man is called a ”little world” [*Aristotle, _Phys._ viii. 2], because the soul is in the body, as G.o.d is in the world. But G.o.d is in the world in such a way, that everything in the world obeys His command. Therefore all that is in man, even the powers of the vegetal soul, obey the command of reason.

Obj. 3: Further, praise and blame are awarded only to such acts as are subject to the command of reason. But in the acts of the nutritive and generative power, there is room for praise and blame, virtue and vice: as in the case of gluttony and l.u.s.t, and their contrary virtues. Therefore the acts of these powers are subject to the command of reason.

_On the contrary,_ Gregory of Nyssa [*Nemesius, De Nat. Hom. xxii.]

says that ”the nutritive and generative power is one over which the reason has no control.”

_I answer that,_ Some acts proceed from the natural appet.i.te, others from the animal, or from the intellectual appet.i.te: for every agent desires an end in some way. Now the natural appet.i.te does not follow from some apprehension, as [d]o the animal and the intellectual appet.i.te. But the reason commands by way of apprehensive power.

Wherefore those acts that proceed from the intellective or the animal appet.i.te, can be commanded by reason: but not those acts that proceed from the natural appet.i.te. And such are the acts of the vegetal soul; wherefore Gregory of Nyssa (Nemesius, De Nat. Hom. xxii) says ”that generation and nutrition belong to what are called natural powers.”

Consequently the acts of the vegetal soul are not subject to the command of reason.

Reply Obj. 1: The more immaterial an act is, the more n.o.ble it is, and the more is it subject to the command of reason. Hence the very fact that the acts of the vegetal soul do not obey reason, shows that they rank lowest.

Reply Obj. 2: The comparison holds in a certain respect: because, to wit, as G.o.d moves the world, so the soul moves the body. But it does not hold in every respect: for the soul did not create the body out of nothing, as G.o.d created the world; for which reason the world is wholly subject to His command.

Reply Obj. 3: Virtue and vice, praise and blame do not affect the acts themselves of the nutritive and generative power, i.e.

digestion, and formation of the human body; but they affect the acts of the sensitive part, that are ordained to the acts of generation and nutrition; for example the desire for pleasure in the act of taking food or in the act of generation, and the right or wrong use thereof. ________________________

NINTH ARTICLE [I-II, Q. 17, Art. 9]

Whether the Acts of the External Members Are Commanded?

Objection 1: It would seem that the members of the body do not obey reason as to their acts. For it is evident that the members of the body are more distant from the reason, than the powers of the vegetal soul. But the powers of the vegetal soul do not obey reason, as stated above (A. 8). Therefore much less do the members of the body obey.

Obj. 2: Further, the heart is the principle of animal movement. But the movement of the heart is not subject to the command of reason: for Gregory of Nyssa [*Nemesius, De Nat. Hom. xxii.] says that ”the pulse is not controlled by reason.” Therefore the movement of the bodily members is not subject to the command of reason.

Obj. 3: Further, Augustine says (De Civ. Dei xiv, 16) that ”the movement of the genital members is sometimes inopportune and not desired; sometimes when sought it fails, and whereas the heart is warm with desire, the body remains cold.” Therefore the movements of the members are not obedient to reason.

_On the contrary,_ Augustine says (Confess. viii, 9): ”The mind commands a movement of the hand, and so ready is the hand to obey, that scarcely can one discern obedience from command.”

_I answer that,_ The members of the body are organs of the soul's powers. Consequently according as the powers of the soul stand in respect of obedience to reason, so do the members of the body stand in respect thereof. Since then the sensitive powers are subject to the command of reason, whereas the natural powers are not; therefore all movements of members, that are moved by the sensitive powers, are subject to the command of reason; whereas those movements of members, that arise from the natural powers, are not subject to the command of reason.

Reply Obj. 1: The members do not move themselves, but are moved through the powers of the soul; of which powers, some are in closer contact with the reason than are the powers of the vegetal soul.

Reply Obj. 2: In things pertaining to intellect and will, that which is according to nature stands first, whence all other things are derived: thus from the knowledge of principles that are naturally known, is derived knowledge of the conclusions; and from volition of the end naturally desired, is derived the choice of the means. So also in bodily movements the principle is according to nature. Now the principle of bodily movements begins with the movement of the heart. Consequently the movement of the heart is according to nature, and not according to the will: for like a proper accident, it results from life, which follows from the union of soul and body. Thus the movement of heavy and light things results from their substantial form: for which reason they are said to be moved by their generator, as the Philosopher states (Phys. viii, 4). Wherefore this movement is called ”vital.” For which reason Gregory of Nyssa (Nemesius, De Nat.

Hom. xxii) says that, just as the movement of generation and nutrition does not obey reason, so neither does the pulse which is a vital movement. By the pulse he means the movement of the heart which is indicated by the pulse veins.

Reply Obj. 3: As Augustine says (De Civ. Dei xiv, 17, 20) it is in punishment of sin that the movement of these members does not obey reason: in this sense, that the soul is punished for its rebellion against G.o.d, by the insubmission of that member whereby original sin is transmitted to posterity.

But because, as we shall state later on, the effect of the sin of our first parent was that his nature was left to itself, through the withdrawal of the supernatural gift which G.o.d had bestowed on man, we must consider the natural cause of this particular member's insubmission to reason. This is stated by Aristotle (De Causis Mot.

Animal.) who says that ”the movements of the heart and of the organs of generation are involuntary,” and that the reason of this is as follows. These members are stirred at the occasion of some apprehension; in so far as the intellect and imagination represent such things as arouse the pa.s.sions of the soul, of which pa.s.sions these movements are a consequence. But they are not moved at the command of the reason or intellect, because these movements are conditioned by a certain natural change of heat and cold, which change is not subject to the command of reason. This is the case with these two organs in particular, because each is as it were a separate animal being, in so far as it is a principle of life; and the principle is virtually the whole. For the heart is the principle of the senses; and from the organ of generation proceeds the seminal virtue, which is virtually the entire animal. Consequently they have their proper movements naturally: because principles must needs be natural, as stated above (Reply Obj. 2).

________________________