“All men desire the good.” This doctrine, which lay at the root of the ethics and also of a great part of the metaphysics of Greek and mediæval thinkers, is either a truism or a paradox, according to the interpretation we place upon it. Its meaning is far from obvious; it veils a multitude of implications and has given rise to a swarm of misconceptions. It has been assumed that all desire is sub ratione boni; nay more, the good has been defined as the object of universal desire, as “that at which all things aim.” The view that desire is conditioned by prior apprehension of the good has provoked the rejoinder that desires precede consciousness of their end, that cognition is the result of, or at least concomitant with, the conative process which reveals it. Again, it may be asked whether the gooddesired is necessarily my own good, so that its attainment may beconstrued as self-realization; and, if so, whether it is private tomyself or a common good which can be shared with others. Is heereone absolute Good, knowable by man, to which all other goodsare relative? Is it possible to pass beyond what we opine and believeto be good, so as to know and desire what is “really” good?