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It is not only the needs of public religion and private safety which have compelled this secrecy about philosophy, not only its intellectual hardness and mystical subtlety. There have also been the dangers involved in its meditational exercises. These bring eventually the powers of a concentrated mind and of a concentrated dynamism to bear upon life. If selfishness or ambition, passion or desire, greed or appetite be strong and ungratified, then it is likely that these powers will be made to serve ignoble ends or, worse, to injure others in the process.
-- Notebooks Category 20: What Is Philosophy? > Chapter 2 : Its Contemporary Influence > # 256