He who lives in the single exercise of his mental faculties, however usefully or curiously directed, is equally an imperfect animal with the man who knows only the exercise of muscles.
一个人如果只运用他的一种智力，不管这种智力的运用是多么有用，是多么奇特，那么他和一个只知道运用肌肉的人一样，都是一种不完美的动物。
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Single
Exercise
Imperfect