It would, of course, be easy to bring about peace if there were no vigor in the world. The Roman Empire was pacific and unproductive; the Athens of Pericles was the most productive and almost the most warlike community known to history. The only form of production in which our own age excels is science, and in science Germany, the most warlike of Great Powers, is supreme. It is useless to multiply examples; but it is plain that the very same vital energy which produces all that is best also produces war and the love of war. This is the basis of the opposition to pacifism felt by many men whose aims and activities are by no means brutal. Pacifism, in practice, too often expresses merely lack of force, not the refusal to use force in thwarting others. Pacifism, if it is to be both victorious and beneficent, must find an outlet, compatible with humane feeling, for the vigor which now leads nations into war and destruction. This problem was considered by William James in an admirable address on “The Moral Equivalent of War,” delivered to a congress of pacifists during the Spanish-American War of 1898. His statement of the problem could not be bettered; and so far as I know, he is the only writer who has faced the problem adequately. But his solution is not adequate; perhaps no adequate solution is possible. The problem, however, is one of degree: every additional peaceful outlet for men’s energies diminishes the force which urges nations towards war, and makes war less frequent and less fierce. And as a question of degree, it is capable of more or less partial solutions.[11]