It used to be customary for invalid ladies to expect at least one of their daughters to sacrifice themselves completely in performing the duties of a nurse, even to the extent of forgoing marriage. This is to expect of another a degree of altruism which is contrary to reason, since the loss to the altruist is greater than the gain to the egoist.
Source: The Conquest of Happiness, 1930, chap.8:Persecution mania
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