Ultimately our moral sense or conscience becomes a highly complex sentiment — originating in the social instinct, largely guided by the approbation of our fellow men, ruled by reason, self-interest, and in later times by deep religious feelings, and confirmed by instruction and habit.

Charles Darwin (1809-1882) English naturalist
The Descent of Man, 2d ed., ch. 5 (1874)
Added on 15-Apr-09 | Last updated 15-Apr-09
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