It is undeniable that the exercise of a creative power, that a free creative activity, is the true function of man; it is proved to be so by man's finding in it his true happiness. But it is un- deniable, also, that men may have the sense of exercising this free creative activity in other ways than in producing great works of literature or art; if it were not so, all but a very few men would be shut out from the true happiness of all men.