Abraham Lincolns position on slavery in the United States is one of the most discussed aspects of his life. Lincoln often expressed moral opposition to slavery in public and private. "I am naturally anti-slavery. If slavery is not wrong, nothing is wrong," he stated in a now-famous quote. "I can not remember when I did not so think, and feel." However, the question of what to do about it and how to end it, given that it was so firmly embedded in the nation's constitutional framework and in the economy of much of the country, was complex and politically challenging. In addition, there was the unanswered question, which Lincoln had to deal with, of what would become of the four million slaves when they were set free, and how would they be provided for in a society that had long rejected them, or looked down on their very presence.