A man who has no assured and ever present belief in the existence of a personal God or of a future existence with retribution and reward, can have for his rule of life, as far as I can see, only to follow those impulses and instincts which are the strongest or which seem to him the best ones.
Source:The Autobiography of Charles Darwin (1809-1882) with orginal omissions restored Edited with Appendix and Notes by his grand-daughter by Nora Barlow (1958)
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