“Up to this time, as I believe, slavery had been let alone, as it claimed to be, in good faith. Up to this time it is clear enough in our history that there was no general perception of the terrible truth that slavery was a system aggressive in its very nature, and necessarily destructive of Constitutional rights and liberties. Up to this time there had been a general blindness to the fact that, under the plea, which was allowed, that it was a local and State institution, slavery had acquired an absolute national supremacy, and if not checked would presently declare itself in national law as the national policy. I think that the eyes of the people were opened rather by the frank statements and legislative action in Congress of the slave party; by the speeches of Mr. Calhoun, filtered through lesser minds and mouths than his; at last by the events in Kansas forcing every man to consider whether, while we had let slavery alone, it had also let us alone; and forcing him to see that its hand was already upon the throat of freedom in this country. I think that by the cuts of the slave party, not by the words of the technical abolitionists, the country was at last aroused. The moral wrong and the political despotism of the system were at last perceived, and a reconstruction of political parties was inevitable. For in human society, while the individual conscience is the steam or motive power, political methods are the engine and the wheels by which progress is effected and secured.”

1850s, The Present Aspect of the Slavery Question (1859)