Voluntas per hoc quod vult finem, movet seipsam ad volendum ea quae sunt ad finem, quia inquantum actu vult finem, reducit se de potentia in actum respectu eorum quae sunt ad finem, ut scilicet actu ea velit.
The will, through its volition of the end, moves itself to will the means, because inasmuch as it actually wills the end, it reduces itself from potentiality to act, in respect of the means, so as, in a word, to will them actually.
Potentia voluntatis semper actu est sibi praesens, sed actus voluntatis, quo vult finem aliquem, non semper est in ipsa voluntate. Per hunc autem movet seipsam.
The power of the will is always actually present to itself; but the act of the will, whereby it wills an end, is not always in the will. But it is by this act that it moves itself.
Voluntas movetur ab intellectu, et a seipsa. Sed ab intellectu quidem movetur secundum rationem obiecti, a seipsa vero, quantum ad exercitium actus, secundum rationem finis.
The will is moved by the intellect, and also by itself. By the intellect it is moved by the formal aspect of the object; whereas it is moved by itself, as to the exercise of its act, by the formal aspect of the end.
Sicut supra dictum est, ad voluntatem pertinet movere alias potentias ex ratione finis, qui est voluntatis obiectum. Sed sicut dictum est, hoc modo se habet finis in appetibilibus, sicut principium in intelligibilibus.
As stated above (q9 a1), it belongs to the will to move the other powers, by the formal aspect of the end which is the will's object. Now, as stated above (q8 a2), the end is in things appetible, what the principle is in things intelligible.
Manifestum est autem quod intellectus per hoc quod cognoscit principium, reducit seipsum de potentia in actum, quantum ad cognitionem conclusionum, et hoc modo movet seipsum. Et similiter voluntas per hoc quod vult finem, movet seipsam ad volendum ea quae sunt ad finem.
But it is evident that the intellect, through its knowledge of the principle, reduces itself from potentiality to act, as to its knowledge of the conclusions, and thus it moves itself. And, in like manner, the will, through its volition of the end, moves itself to will the means.