Sects who cling to their little fanaticisms with blind fervour show thereby their lack of balance. The philosopher also clings to truth with even more fervour because he sees what it is that he is clinging to, but he does so calmly, maintains a considerable self-effacing equilibrium, and keeps a large tolerance. He knows too that the truth is substantiated by observed fact, by the highest kind of feeling, by the oldest religion and the newest science.
-- Notebooks Category 20: What Is Philosophy? > Chapter 5: The Philosopher > # 96