Henry Sidgwick makes the following startling statement:
For though doubtless a man may often best promote his own happiness by laboring and abstaining for the sake of others, it seems to be implied in our common notion of self-sacrifice that actions most conducive to the general happiness do not — in this world at least — always tend also to the greatest happiness of the agent. …
[C]ircumstances are conceivable in which a man is not unlikely to think that he could best promote the Excellence of others by sacrificing his own. But no moralist who takes Excellence as an ultimate end has ever approved of such sacrifice, at least as far as Moral Excellence is concerned; no one has ever directed an individual to promote the virtue of others except in so far as this promotion is compatible with, or rather involved in, the complete realization of Virtue in himself. (The Methods of Ethics, 9ff)
But virtue is for the sake of happiness. Apparently, then, there are two kinds of happiness: one which is produced with the help of some excellence of character, virtue, or art, and another, not produced in that way. The former can under no circumstances be sacrificed for the sake of another; the latter can be and is, at least according to utilitarianism. What are the properties of these kinds of happiness?
We can approach the answer by reading St. Thomas. He first distinguishes between imperfect happiness which can be attained in this life and perfect happiness, which consists in the contemplation of God. In II-I, 1 through 5, he considers these issues, in particular, (1) those things that can generate imperfect happiness but that are neither necessary nor sufficient for perfect happiness (that is, things without which one can still be happy) in Q. 2; (2) things that are necessary for perfect happiness (among which he numbers pleasure, comprehension, righteousness, and, with qualifications, perfection of the body) in Q. 4; and (3) the one thing that is sufficient for perfect happiness, namely the vision of God in Q. 3. Commenting on (1) and foreshadowing the economists’ (correct) claim that human desires are for all intents and purposes unlimited, Aquinas writes:
the desire for artificial wealth is infinite, for it is the servant of disordered concupiscence, which is not curbed… Yet this desire for wealth is infinite otherwise than the desire for the sovereign good. For the more perfectly the sovereign good is possessed, the more it is loved, and other things despised: because the more we possess it, the more we know it. … Whereas in the desire for wealth and for whatsoever temporal goods, the contrary is the case: for when we already possess them, we despise them, and seek others: which is the sense of Our Lord’s words: “Everyone who drinks this water,” by which temporal goods are signified, “will be thirsty again.” The reason of this is that we realize more their insufficiency when we possess them: and this very fact shows that they are imperfect, and the sovereign good does not consist therein. (2, 1, ad 3)
… it is evident that naught can lull man’s will, save the universal good. This is to be found, not in any creature, but in God alone; because every creature has goodness by participation. (2, 8)
(I disagree, however, that the distinction between natural and artificial goods is tenable.)
Thus, wealth, honor, fame, power are such that if you fail to obtain them, you would lose little, for the will is not truly rested in those goods but seeks still something else. Therefore, if utilitarianism demands that you forgo some of these goods, it may have a case. But it is precisely perfect happiness that is the reward for virtue. Hence if you were to be deprived from the beatific vision, e.g., through viciousness of character, you would lose everything. And no one could be asked to make such an enormous (infinite) sacrifice for the sake of the merely imperfect (and finite) happiness of others. It is conceivable that God’s providence might trade off one person’s perfect happiness for another’s perfect happiness or one person’s imperfect happiness for another’s imperfect happiness. But one can never be obligated to exchange his perfect happiness even for an improved imperfect happiness of the rest of the world. Nevertheless, just as grace requires nature, and glory, grace, so does everlasting happiness with God require striving for happiness in general, of whatever kind. For example, though Aquinas denies that ultimate happiness “consists in the consideration of speculative sciences,” still, such consideration might be one’s vocation and therefore the source of merit and therefore glory and reward. He agrees that wealth “cannot be man’s last end, rather is it ordained to man as to its end” but in being so ordained, it can at least be a useful good, a means to perfect happiness.