What shall be said, then, of those who insist upon ignoring the question of slavery as not involved in this deadly feud, and maintain that the only issue is, the support of the government and the preservation of the Union? Surely, they are "fools and blind"; for it is slaveholders alone who have conspired to seize the one, and overturn the other. As long as the enslavement of a single human being is sanctioned in the land, the curse of God will rest upon it.

The War — Its Cause and Cure (3 May 1861)