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Reason is no mere slave

“Human beings are not the perfectly rational creatures they would be if they strove for truth and consistency at all times. Nevertheless, if we can be motivated by a desire to eliminate inconsistency in our beliefs and actions, reason is no mere slave. We may use reason to enable us to satisfy our needs, but reason then develops its own motivating force”

Peter Singer (1981). The Expanding Circle: Ethics and Sociobiology, p. 143