Of what use, in such serious matters as survival, to live in so many illusions? Sentimentalists and emotionalists who desert reason at the bidding of well-intentioned, high ideals or religion to preach unrealistic attitudes do not know the difference between religio-mystic ethics and philosophic ethics. Only the latter is practical in the highest sense as well as the worldly one. Foolish teachers, professors, and those whose lives are spent in academic circles are suborned by these emotions more easily than are other people, just because their distance from the world of practical decisions and realistic affairs have made them one-sided.
-- Notebooks Category 6: Emotions and Ethics > Chapter 3: Discipline Emotions > # 23