Thomas Aquinas

“ I answer that, The movement of the will is from within, as also is the movement of nature. Now although it is possible for something to move a natural thing, without being the cause of the thing moved, yet that alone, which is in some way the cause of a thing's nature, can cause a natural movement in that thing. ”

“ I answer that, It is evident that the will can be moved by the heavenly bodies in the same way as it is moved by its object; that is to say, in so far as exterior bodies, which move the will, through being offered to the senses, and also the organs themselves of the sensitive powers, are subject to the movements of the heavenly bodies.
But some have maintained that heavenly bodies have an influence on the human will, in the same way as some exterior agent moves the will, as to the exercise of its act. ”

“ Nothing hinders that which is better simply and in itself, from being less excellent in a certain respect. Accordingly the will is simply more excellent than the sensitive appetite: but in respect of the man in whom a passion is predominant, in so far as he is subject to that passion, the sensitive appetite is more excellent. ”

“ Just as the imagination of a form without estimation of fitness or harmfulness, does not move the sensitive appetite; so neither does the apprehension of the true without the aspect of goodness and desirability. Hence it is not the speculative intellect that moves, but the practical intellect (De Anima iii, 9) . ”

“ And hence it is that taste, according as it is variously disposed, takes to a thing in various ways, as being fitting or unfitting. Wherefore as the Philosopher says (Ethic. iii, 5) : "According as a man is, such does the end seem to him."
Now it is evident that according to a passion of the sensitive appetite man is changed to a certain disposition. Wherefore according as man is affected by a passion, something seems to him fitting, which does not seem so when he is not so affected: thus that seems good to a man when angered, which does not seem good when he is calm. ”

“ Wherefore though the voluntary act has an inward proximate principle, nevertheless its first principle is from without. Thus, too, the first principle of the natural movement is from without, that, to wit, which moves nature. ”

“ But human movements are various and multiform, since they begin to be, whereas previously they were not. Therefore they are reduced, as to their cause, to the movement of the heavens, which is uniform according to its nature. ”

“ The intellect flies ahead, the desire follows sluggishly or not at all: we know what is good, but deeds delight us not." But it would not be so, if the will were moved by the intellect: because movement of the movable results from motion of the mover. Therefore the intellect does not move the will.
Objection 2: Further, the intellect in presenting the appetible object to the will, stands in relation to the will, as the imagination in representing the appetible will to the sensitive appetite. ”

“ We must confess that when the truth is foretold by astrologers, this is due to some most hidden inspiration, to which the human mind is subject without knowing it. And since this is done in order to deceive man, it must be the work of the lying spirits. ”