At the beginning of the war, and for some time, the use of colored troops was not contemplated; and how the change of purpose was wrought, I will not now take time to explain. Upon a clear conviction of duty I resolved to turn that element of strength to account; and I am responsible for it to the American people, to the christian world, to history, and on my final account to God.
Lincoln, his life and times (ed. 1891)