Abraham Lincoln had grown to manhood while the question was gaining in importance. As a youth, during his flatboat voyages to New Orleans he had seen negroes chained and beaten, and the injustice of slavery had been stamped upon his soul. The uprightness of his mind abhorred a system that kept men in bondage merely because they happened to be black. The intensity of his feeling on the subject had made him a Whig when, as a friendless boy, he lived in a town where Whig ideas were much in disfavor. The same feeling, growing stronger as he grew older, had inspired the Lincoln-Stone protest and the bill to free the slaves in the District of Columbia, and had caused him to vote at least forty times against slavery in one form or another during his short term in Congress. The repeal of the Missouri Compromise, throwing open once more to slavery a vast amount of territory from which it had been shut out, could not fail to move him deeply. His sense of justice and his strong powers of reasoning were equally stirred, and from that time until slavery came to its end through his own act, he gave his time and all his energies to the cause of freedom. Two points served to make the repeal of the Missouri Compromise of special interest to Lincoln. The first was personal, in that the man who championed the measure, and whose influence in Congress alone made it possible, was Senator Stephen A. Douglas, who had been his neighbor in Illinois for many years. The second was deeper. He realized that the struggle meant much more than the freedom or bondage of a few million black men: that it was in reality a struggle for the central idea of our American republic--the statement in our Declaration of Independence that "all men are created equal." He made no public speeches until autumn, but in the meantime studied the question with great care, both as to its past history and present state. When he did speak it was with a force and power that startled Douglas and, it is said, brought him privately to Lincoln with the proposition that neither of them should address a public meeting again until after the next election. Douglas was a man of great ambition as well as of unusual political skill. Until recently he had been heartily in favor of keeping slavery out of the Northwest Territory; but he had set his heart upon being President of the United States, and he thought that he saw a chance of this if he helped the South to repeal the Missouri Compromise, and thus gained its gratitude and its votes. Without hesitation he plunged into the work and labored successfully to overthrow this law of more than thirty years' standing.