It is time we put this problem of knowledge, even the problem of the validity of knowledge, into the hands of science. How we come to know, what the process of knowledge is, what “truth” is,--all these are questions of fact; they are problems for the science of psychology, they are not problems for philosophy. This continual sharpening of the knife, as Lotze put it, becomes tiresome--almost pathetic--if, after all, there is no cutting done. Like Faust, who found himself when, blinded by the sun, he turned his face to the earth, so we shall have to forget our epistemological heaven and remember mother earth; we shall have to give up our delightful German puzzles and play our living part in the flow of social purpose. Philosophers must once more learn to live. To make such a demand for a new direction of philosophy to life is after all only a development of pragmatism, turning that doctrine of action as the test and significance of thought to uses not so individual as those in which William James found its readiest application. If philosophy has meaning, it must be as life become aware of its purposes and possibilities, it must be as life cross-examining life for the sake of life; it must be as specialized foresight for the direction of social movement, as reconstructive intelligence in conscious evolution. Man finds himself caught in a flux of change; he studies the laws operating in the flux; studying, he comes to understand; understanding, he comes to control; controlling, he comes face to face with the question of all questions, For what? Where does he wish to go, what does he want to be? It is then that man puts his whole experience before him in synthetic test; then that he gropes for meanings, searches for values, struggles to see and define his course and goal; then that he becomes philosopher. Consider these questions of goal and course as questions asked by a society, and the social function of philosophy appears. Science enlightens means, philosophy must enlighten ends. Science informs, philosophy must form. A philosopher is a man who remakes himself; the social function of philosophy is to remake society.