Following Lincoln's defeat for US Senator from Illinois, he wrote a letter to H. Asbury about why he lost, that problems were imminent, and exhorted to press on for the cause.

11/19/1858 ...The fight must go on. The cause of civil liberty must not be surrendered at the end of one, or even, one hundred defeats. Douglas had the ingenuity to be supported in the late contest both as the best means to break down, and to uphold the slave interest. No ingenuity can keep those antagonistic elements in harmony long. Another explosion will soon come... LL 286