There is the natural appetite, which belongs to the powers of the vegetal soul.

Much more, therefore, are the powers of the vegetal soul.

But natural love seems to pertain rather to the natural powers, which belong to the vegetal soul.

But the powers of the vegetal soul do not obey reason, as stated above (A.

Objection 1: It would seem that the acts of the vegetal soul are 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.

For it is evident that the members of the body are more distant from the reason, than the powers of the vegetal soul.

(8) Whether the act of the vegetal soul is commanded?