Already the liberal party throughout the world, express the apprehension that the one retrograde institution in America, is undermining the principles of progress, and fatally violating the noblest political system the world ever saw. This is not the taunt of enemies, but the warning of friends. Is it quite safe to disregard it—to despise it? Is there no danger to liberty itself, in discarding the earliest practice, and first precept of our ancient faith? In our greedy chase to make profit of the negro, let us beware, lest we cancel and tear to pieces even the white man's charter of freedom.

Speech at Peoria, Illinois (1854)