From Lincoln’s “House Divided” speech.
“A house divided against itself cannot stand.”
I believe this government cannot endure, permanently half slave and half free.
I do not expect the Union to be dissolved — I do not expect the house to fall — but I do expect it will cease to be divided.
It will become all one thing or all the other.
Either the opponents of slavery, will arrest the further spread of it, and place it where the public mind shall rest in the belief that it is in the course of ultimate extinction; or its advocates will push it forward, till it shall become alike lawful in all the States, old as well as new — North as well as South.”
You can read the entire speech here.
Those who would re-write history like to cite the House Divided speech as foundation for their assertion that Lincoln was ambivalent about slavery, that his concern was saving the union not ending slavery. However, Lincoln’s response to Douglas’ speech puts the lie to any such notion.
Those arguments that are made, [by Lincoln’s opposing Democrats] that the inferior race are to be treated with as much allowance as they are capable of enjoying; that as much is to be done for them as their condition will allow. What are these arguments? They are the arguments that kings have made for enslaving the people in all ages of the world. You will find that all the arguments in favor of king-craft were of this class; they always bestrode the necks of the people, not that they wanted to do it, but because the people were better off for being ridden. That is their argument, and this argument of the Judge [Douglas] is the same old serpent that says you work and I eat, you toil and I will enjoy the fruits of it.
Turn in whatever way you will—whether it come from the mouth of a King, an excuse for enslaving the people of his country, or from the mouth of men of one race as a reason for enslaving the men of another race, it is all the same old serpent, and I hold if that course of argumentation that is made for the purpose of convincing the public mind that we should not care about this, should be granted, it does not stop with the negro. I should like to know if taking this old Declaration of Independence, which declares that all men are equal upon principle and making exceptions to it where will it stop. If one man says it does not mean a negro, why not another say it does not mean some other man?
If that declaration is not the truth, let us get the Statute book, in which we find it and tear it out! Who is so bold as to do it! [Voices—“me” “no one,” &c.] If it is not true let us tear it out! [cries of “no, no,”] Let us stick to it then. [cheers], Let us stand firmly by it then. [Applause.]
The text of the Lincoln/Douglas debates can be found here.