Considering the moral standard of the individual and the moral standard of groups of individuals, Darwin concluded:
It must not be forgotten that although a high standard of morality gives but a slight or no advantage to each individual man and his children over the other men of the same tribe . . . an increase in the number of well-endowed men and an advancement in the standard of morality will certainly give an immense advantage to one tribe over another.
(Quoted from page 166 of The Descent of Man, and Selection in Relation to Sex, Volumes 1 and 2. Appleton, 1871.)
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