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. ”
