Doubt has a legitimate use in the world of thought. Without it, we should be at the mercy of every charlatan, every fool, every exploiter, and every false doctrine. We need not be ashamed therefore to avail ourselves of it at times. Doubt tears the veil off deceit and exposes humbug hidden beneath benevolence.
-- Notebooks Category 7: The Intellect > Chapter 2: The Service of Intellect > # 121