The Existence of the Last End

(Summa Theologica, I-II, qq. 1-5; Contra Gentes, IV, cc. 1-63.)

Existence of the Last End.—Every deliberate act proceeds from the will, and, since the will pursues good as its goal, it follows that every deliberate act is done for some good or end. But, if this end is an imperfect good, it is desired not for itself but as leading up to a perfect good, that is, to one which will leave nothing beyond it to be desired; in other words, the intermediate end is willed on account of a last end. Hence, all that a man wills, he wills directly or indirectly on account of a last end. All men desire their own happiness and perfection; but not all understand in what beatitude consists, since some aim ultimately at finite goods.