On the answer to this question depends entirely every decision concerning the goodness or badness of conduct. By those who think life is not a benefit but a misfortune, conduct which prolongs it is to be blamed rather than praised; the ending of an undesirable existence being the thing to be wished, that which causes the ending of it must be applauded; while actions furthering its continuance, either in self or others, must be reprobated. Those who, on the other hand, take an optimistic view, or who, if not pure optimists, yet hold that in life the good exceeds the evil, are committed to opposite estimates; and must regard as conduct to be approved that which fosters life in self and others, and as conduct to be disapproved that which injures or endangers life in self or others. The ultimate question, therefore, is: Has evolution been a mistake; and especially that evolution which improves the adjustment of acts to ends in ascending stages of organization? If it is held that there had better not have been any animate existence at all, and that the sooner it comes to an end the better; then one set of conclusions with respect to conduct emerges. If, contrariwise, it is held that there is a balance in favor of animate existence, and if, still further, it is held that in the future this balance may be increased; then the opposite set of conclusions emerges. Even should it be alleged that the worth of life is not to be judged by its intrinsic character, but rather by its extrinsic sequences--by certain results to be anticipated when life has passed--the ultimate issue reappears in a new shape. For though the accompanying creed may negative a deliberate shortening of life that is miserable, it cannot justify a gratuitous lengthening of such life. Legislation conducive to increased longevity would, on the pessimistic view, remain blameable, while it would be praiseworthy on the optimistic view. But now, have these irreconcilable opinions anything in common? Men being divisible into two schools differing on this ultimate question, the inquiry arises--Is there anything which their radically opposed views alike take for granted? In the optimistic proposition, tacitly made when using the words good and bad after the ordinary manner; and in the pessimistic proposition overtly made, which implies that the words good and bad should be used in the reverse senses; does examination disclose any joint proposition--any proposition which, contained in both of them, may be held more certain than either--any universally asserted proposition?