If we were all given by magic the power to read each other's thoughts I suppose the first effect would be that almost all friendships would be dissolved; the second effect, however, might be excellent, for a world without any friends would be felt to be intolerable, and we should learn to like each other without needing a veil of illusion to conceal from ourselves that we did not think each other absolutely perfect.
Source: The Conquest of Happiness, 1930, chap.8: Persecution mania<
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