Summary

Portrait of Thomas Aquinas Thomas Aquinas Summa Theologica — Treatise on Human Acts…

Further, the acts of the will reflect on one another; for I will to will, and I love to love. But to enjoy is an act of the will: since "it is the will with which we enjoy," as Augustine says (De Trin. x, 10) . Therefore a man enjoys his enjoyment. But the last end of man is not enjoyment, but the uncreated good alone, which is God. Therefore enjoyment is not only of the last end.
On the contrary, Augustine says (De Trin. x, 11) : "A man does not enjoy that which he desires for the sake of something else." But the last end alone is that which man does not desire for the sake of something else.
Source: Wikisource

Portrait of Thomas Aquinas Thomas Aquinas Summa Theologica — Treatise on Human Acts…

Now things void of reason have indeed a power of achieving an end by way of execution, as that by which a heavy body has a downward tendency, whereas a light body has an upward tendency. Yet the power of command in respect of the end is not in them, but in some higher nature, which moves all nature by its command, just as in things endowed with knowledge, the appetite moves the other powers to their acts. Wherefore it is clear that things void of knowledge, although they attain an end, have no enjoyment of the end: this is only for those that are endowed with knowledge.
Source: Wikisource

Portrait of Thomas Aquinas Thomas Aquinas Summa Theologica — Treatise on Human Acts…

Sometimes, however, the reason is not entirely engrossed by the passion, so that the judgment of reason retains, to a certain extent, its freedom: and thus the movement of the will remains in a certain degree. Accordingly in so far as the reason remains free, and not subject to the passion, the will's movement, which also remains, does not tend of necessity to that whereto the passion inclines it. Consequently, either there is no movement of the will in that man, and the passion alone holds its sway: or if there be a movement of the will, it does not necessarily follow the passion.
Source: Wikisource

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