The advocacy of truth in a truthless world is fraught with considerable danger. It must be done cautiously, discreetly, quietly, unobtrusively, and it must be limited only to those who are ready for it. Not only must it not be discussed with the unready--a futile self-deceptive procedure at best and a trouble-causing one too often--but they must definitely be avoided. Otherwise their hostility will sooner or later be aroused.
-- Notebooks Category 20: What Is Philosophy? > Chapter 2: Its Contemporary Influence > # 263