Yat-sen proposed to modify only those which could be improved by a reaction to the excellencies of Chinese antiquity, or benefited by the influence of Western science. Sun Yat-sen was, as Wilhelm states, both a revolutionary and a reconstitutionary. He was reconstitutionary in the ideology which he proposed, and a revolutionary by virtue of the political methods which he was willing to sanction and employ in carrying the ideology into the minds of the Chinese populace. In the second place, Sun Yat-sen proposed to modify the old ideology not only with respect to content but also with regard to method of development. The Confucians had, as we have seen, provided for the continual modification and rectification of the ideology by means of the doctrine of _chêng ming_. It is a matter of dispute as to what degree that doctrine constituted a scientific method for propagating knowledge.(102) Whatever the method of the ancients, Sun Yat-sen proposed to modify it in three steps: the acknowledgment of the pragmatic foundations of social ideas, the recognition of the necessity for knowledge before action, and the introduction of the experimental method. His pragmatic position shows no particular indication of having been derived from any specific source; it was a common enough tendency in old Chinese thought, from the beginning; in advocating it, Sun Yat-sen may have been revolutionary only in his championing of an idea which he may well have had since early childhood. His stress upon the necessity of ideological clarity as antecedent to revolutionary or any other kind of action is negatively derived from Wang Yang-ming, whose statement of the converse Sun Yat-sen was wont to attack. The belief in the experimental method is clearly enough the result of his Western scientific training—possibly in so direct a fashion as the personal influence of one of his instructors, Dr. James Cantlie, later Sir James Cantlie, of Queen’s College, Hongkong. Sun Yat-sen was a physician; his degree _Dr._ was a medical and not an academic one; and there is no reason to overlook the influence of his vocation, a Western one, in estimating the influence of the Western experimental method.(103)