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1 " The following proposition seems to me in a high degree probable—namely, that any animal whatever, endowed with well-marked social instincts, the parental and filial affections being here included, would inevitably acquire a moral sense or conscience, as soon as its intellectual powers had become as well, or nearly as well developed, as in man. For, firstly, the social instincts lead an animal to take pleasure in the society of its fellows, to feel a certain amount of sympathy with them, and to perform various services for them. "
― Charles Darwin , The Descent of Man
2 " Besides love and sympathy, animals exhibit other qualities connected with the social instincts which in us would be called moral. "
― Charles Darwin
