In some respects (a black woman) certainly is not my equal; but in her natural right to eat the bread she earns with her own hands without asking leave of any one else, she is my equal, and the equal of all others.
And that sentiment, my FRiend, is not 21st century sensibility. It was commonly held throughout mid-19th century Christendom, with the notable exception only of Russia and of certain areas of the USA.
Lincoln was a slime ball no question he tailored his speech message to the crowd. He had no moral compass at all.