By the single fact of its refusal to proselytize, philosophy is taken out of the ranks of conventional teaching; but by its daring thought it is taken out even more. And it is distinguished even more by the calm tolerance of its attitude towards other teachings, by the measured fairness with which it appraises them, and by its refusal to degenerate into personal offensiveness or bitter animosity. It knows quite well that truth cannot be elucidated in an atmosphere of angry feelings and personal polemics.
-- Notebooks Category 20: What Is Philosophy? > Chapter 2: Its Contemporary Influence > # 311