While this nation is guilty of the enslavement of three millions of innocent men and women, it is as idle to think of having a sound and lasting peace, as it is to think there is no God to take cognizance of the affairs of men. There can be no peace to the wicked while slavery continues in the land. It will be condemned; and while it is condemned there will be agitation. Nature must cease to be nature; men must become monsters; humanity must be transformed; Christianity must be exterminated; all ideas of justice and the laws of eternal goodness must be utterly blotted out from the human soul—ere a system so foul and infernal can escape condemnation, or this guilty republic can have a sound, enduring peace.

The Nature of Slavery. Extract from a Lecture on Slavery, at Rochester, December 1, 1850 - My Bondage and My Freedom (1855)