Sun Yat-sen pointed out the fact that while manuals of warfare become obsolete in a very few years in the West, political ideas and institutions do not. He cited the continuance of the same pattern of government in the United States, and the lasting authority of the _Republic_ of Plato, as examples of the stagnation of the Western social sciences as contrasted with physical sciences. Already prepossessed in favor of the Chinese knowledge and morality in non-technical matters, he did not demand the introduction of Western social methods as well. He had lived long enough in the West to lose some of the West-worship that characterized so many Chinese and Japanese of his generation. He was willing, even anxious, that the experimental method, by itself, be introduced into Chinese thought in all fields,(96) but not particularly impressed with the general superiority of Western social thought. Sun Yat-sen’s own exposition of the reasons for his desiring to limit the rôle played by Western science in China is quite clear.(97) In the first place, Sun Yat-sen was vigorously in favor of adopting the experimental method in attaining knowledge. He stood firmly for the pragmatic foundation of knowledge, and for the exercise of the greatest care and most strenuous effort in discovering it. Secondly, he believed in taking over the physical knowledge of the Westerners, although—in his emphasis on Chinese talent—he by no means believed that Western physical knowledge would displace that of the Chinese altogether. “We can safely imitate the material civilization of Europe and of America; we may follow it blindly, and if we introduce it in China, it will make good headway.”(98) Thirdly, he believed that the social science of the West, and especially its political philosophy, might lead the Chinese into gross error, since it was derived from a quite different ideology, and not relevant to Chinese conditions. “It would be a gross error on our part, if, disregarding our own Chinese customs and human sentiments, we were to try to force upon (our people) a foreign type of social government just as we copy a foreign make of machinery.”(99) Fourthly, even apart from the difference between China and the West which invalidated Western social science in China, he did not believe that the West had attained to anything like the same certainty in social science that it had in physical science.(100) Fifthly, Sun Yat-sen believed that the Chinese should profit by observing the experiments and theories of the West in regard to social organization, without necessarily following them.