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A conception of something called human nature arises not unnaturally on observing the passions of men, passions which under various disguises seem to reappear in all ages and countries. The tendency of Greek philosophy, with its insistence on general concepts, was to define this idea of human nature still further and to encourage the belief that a single and identical essence, present in all men, determined their powers and ideal destiny. Christianity, while it transposed the human ideal and dwelt on the superhuman affinities of man, did not abandon the notion of a specific humanity. On the contrary, such a notion was implied in the Fall and Redemption, in the Sacraments, and in the universal validity of Christian doctrine and precept. For if human nature were not one, there would be no propriety in requiring all men to preserve unanimity in faith or conformity in conduct. Human nature was likewise the entity which the English psychologists set themselves to describe; and Kant was so entirely dominated by the notion of a fixed and universal human nature