Both men were born 1809. But they chose different paths.
“At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate and replace throughout the world the savage races. …The break will then be rendered wider, for it will intervene between man in a more civilized state, as we may hope, than the Caucasian, and some ape as low as a baboon, instead of as at present between the negro or Australian and the gorilla.” –Charles Darwin, The Descent of Man, 1871 p. 193
“If the negro is a man, why then my ancient faith teaches me that “all men are created equal;” and that there can be no moral right in connection with one man’s making a slave of another.”
–Abraham Lincoln, Peoria speech 1854