The most fruitful point of view is, no doubt, that which considers the genius a variation. And unless we do this it is evidently impossible to get any theory which will bring him into a general scheme. But how great a variation? And in what direction?--these are the questions. The great variations found in the criminal by heredity, the insane, the idiotic, etc., we have found excluded from society; so we may well ask why the genius is not excluded also. If our determination of the limits within which society decides who is to be excluded is correct, then the genius must come within these limits. He can not escape them and live socially. _The Intelligence of the Genius._--The directions in which the genius actually varies from the average man are evident as a matter of fact. He is, first of all, a man of great power of thought, of great "constructive imagination," as the psychologists say. So let us believe, first, that a genius is a man who has occasionally greater thoughts than other men have. Is this a reason for excluding him from society? Certainly not; for by great thoughts we mean true thoughts, thoughts which will work, thoughts which will bring in a new area in the discovery of principles, or of their application. This is just what all development depends upon, this attainment of novelty, which is consistent with older knowledge and supplementary to it. But suppose a man have thoughts which are not true, which do not fit the topic of their application, which contradict established knowledges, or which result in bizarre and fanciful combinations of them; to that man we deny the name genius; he is a crank, an agitator, an anarchist, or what not. The test, then, which we bring to bear upon the intellectual variations which men show is that of truth, practical workability--in short, to sum it up, "fitness." Any thought, to live and germinate, must be a fit thought. And the community's sense of the fitness of the thought is their rule of judgment. Now, the way the community got this sense--that is the great result we have reached above. Their sense of fitness is just what I called above their judgment. So far, at least, as it relates to matters of social import, it is of social origin. It reflects the outcome of all social heredity, tradition, education. The sense of social truth is their criterion of social thoughts, and unless the social reformer's thought be in some way fit to go into the setting thus made by earlier social development, he is not a genius but a crank.