If A. can prove, however conclusively, that he may, of right, enslave B. Why may not B. snatch the same argument, and prove equally, that he may ensl… - Abraham Lincoln

In those days, as I understand, masters could, at their own pleasure, emancipate their slaves; but since then, such legal restraints have been made upon emancipation, as to amount almost to prohibition. In those days, Legislatures held the unquestioned power to abolish slavery in their respective States; but now it is becoming quite fashionable for State Constitutions to withhold that power from the Legislatures. In those days, by common consent, the spread of the black man's bondage to new countries was prohibited; but now, Congress decides that it will not continue the prohibition, and the Supreme Court decides that it could not if it would. In those days, our Declaration of Independence was held sacred by all, and thought to include all; but now, to aid in making the bondage of the negro universal and eternal, it is assailed, and sneered at, and construed, and hawked at, and torn, till, if its framers could rise from their graves, they could not at all recognize it. All the powers of earth seem rapidly combining against him. Mammon is after him; ambition follows, and philosophy follows, and the Theology of the day is fast joining the cry. They have him in his prison house; they have searched his person, and left no prying instrument with him. One after another they have closed the heavy iron doors upon him, and now they have him, as it were, bolted in with a lock of a hundred keys, which can never be unlocked without the concurrence of every key; the keys in the hands of a hundred different men, and they scattered to a hundred different and distant places; and they stand musing as to what invention, in all the dominions of mind and matter, can be produced to make the impossibility of his escape more complete than it is. It is grossly incorrect to say or assume, that the public estimate of the negro is more favorable now than it was at the origin of the government.

. . . that this nation, under God, shall have a new birth of freedom — and that government of the people, by the people, for the people, shall not perish from the earth.
- President Abraham Lincoln, Gettysburg address, November 19, 1863

This is essentially a people's contest. On the side of the Union it is a struggle for maintaining in the world that form and substance of government whose leading object is to elevate the condition of men; to lift artificial weights from all shoulders; to clear the paths of laudable pursuit for all; to afford all an unfettered start and a fair chance in the race of life. Yielding to partial and temporary departures, from necessity, this is the leading object of the Government for whose existence we contend.