There was no place in the land where the seeker could not find some small budding sign of pity for the slave. No place in all the land but one - the pulpit. It yielded last; it always does. It fought a strong and stubborn fight, and then did what it always does, joined the procession - at the tail end. Slavery fell. The slavery texts in the Bible remained; the practice changed; that was all.
Mark Twain, Paul Baender (1973). “What Is Man? and Other Philosophical Writings”, p.74, Univ of California Press