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“In England, his views were so completely in harmony with those of most intelligent men that it is difficult to trace their influence except in theoretical philosophy; in France, on the other hand, where they led to an opposition to the existing regime in practice and to the prevailing Cartesianism in theory, they clearly had a considerable effect in shaping the course of events. This is an example of a general principle: a philosophy developed in a politically and economically advanced country, which is, in its birthplace, little more than a clarification and systemization of prevalent opinion, may become elsewhere a source of revolutionary ardour, and ultimately of actual revolution. It is mainly through theorists that the maxims regulating the policy of advanced countries become known to less advanced countries. In the advanced countries, practice inspires theory; in the others, theory inspires practice. This difference is one of the reasons why transplanted ideas are seldom so successful as they were in their native soil.” — Bertrand Russell