“Darwin himself, asked about the implications of his theory for religion and morality, replied that while the idea of God was ‘beyond the scope of man’s intellect,’ man’s moral obligations were what they had always been: to ‘do his duty.’ Leslie Stephen, after abandoning the effort to derive an ethic from Darwinism, finally confessed: ‘I now believe in nothing, but I do not the less believe in morality.’ George Eliot uttered the classic statement of this secular ethic when she said that God was ‘inconceivable,’ immortality ‘unbelievable,’ but duty nonetheless ‘peremptory and absolute.’”
Gertrude Himmelfarb The De-moralization of Society