Slavery is wrong in its effect upon white people and free labor; it is the only thing that threatens the Union. It makes what Senator Seward has been much abused for calling an 'irrepressible conflict'. When they get ready to settle it, we hope they will let us know. Public opinion settles every question here, any policy to be permanent must have public opinion at the bottom, something in accordance with the philosophy of the human mind as it is. The property basis will have its weight. The love of property and a consciousness of right or wrong have conflicting places in our organization, which often make a man's course seem crooks, his conduct a riddle.
Speech at Hartford (1860)