John Hay,
Abraham Lincoln: a History — Volume 01
“ Since then we have had thirty-six years of experience; and this experience has demonstrated, I think, that there is no peaceful extinction of slavery in prospect for us. The signal failure of Henry Clay and other good and great men, in 1849, to effect anything in favor of gradual emancipation in Kentucky, together with a thousand other signs, extinguishes that hope utterly. On the question of liberty, as a principle, we are not what we have been. When we were the political slaves of King George, and wanted to be free, we called the maxim that "all men are created equal" a self-evident truth ”
