We have attempted to show that the various interests are social in their very nature. We have not attempted to show that this can be seen or proved in any given case. On the contrary, in most, if not all cases, the agent acts from a faith that, in realizing his own capacity, he will satisfy the needs of society. If he were asked to _prove_ that his devotion to his function were right because certain to promote social good, he might well reply: "That is none of my affair. I have only to work myself out as strength and opportunity are given me, and let the results take care of themselves. I did not make the world, and if it turns out that devotion to the capacity which was given me, and loyalty to the surroundings in which I find myself do not result in good, I do not hold myself responsible. But, after all, I cannot believe that it will so turn out. What is really good for me _must_ turn out good for all, or else there is no good in the world at all." The basis, in a word, of moral conduct, with respect to the exercise of function, is a faith that moral self-satisfaction (that is, satisfaction in accordance with the performance of function as already defined) means social satisfaction--or the faith that self and others make a true community. Now such faith or conviction is at the basis of all moral conduct--not simply of the scientific or artistic. Interest in self must mean belief in one's business, conviction of its legitimacy and worth, even prior to any sensible demonstration. Under any circumstances, such demonstration can extend only to past action; the social efficiency of any new end must be a matter of faith. Where such faith is wanting, action becomes halting and character weak. Forcible action fails, and its place is taken by a feeble idealism, of vague longing for that which is not, or by a pessimistic and fruitless discontent with things as they are--leading, in either case, to neglect of actual and pressing duty. The basis of moral strength is _limitation_, the resolve to be one's self only, and to be loyal to the actual powers and surroundings of that self. The saying of Carlyle's about doing the "duty that lies nearest", and of Goethe's that "America is here or nowhere", both imply that faith in the existing moral capacity and environment is the basis of conduct. All fruitful and sound human endeavor roots in the conviction that there is something absolutely worth while, something 'divine' in the demands imposed by one's actual situation and powers. In the great moral heroes of the world the conviction of the worth of their destiny, and of what they were meant to do, has amounted to a kind of fatalism. They have done not simply what they _could_ do, but what they _must_ do.