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A few quotations regarding slavery, by Lincoln:
I have always hated slavery, I think as much as any Abolitionist.
--July 10, 1858 Speech at Chicago
Now I confess myself as belonging to that class in the country who contemplate slavery as a moral, social and political evil.
--October 7, 1858 Debate at Galesburg, Illinois
That is the real issue. That is the issue that will continue in this country when these poor tongues of Judge Douglas and myself shall be silent. It is the eternal struggle between these two principles -- right and wrong -- throughout the world. They are the two principles that have stood face to face from the beginning of time, and will ever continue to struggle. The one is the common right of humanity and the other the divine right of kings. It is the same principle in whatever shape it develops itself. It is the same spirit that says, "You work and toil and earn bread, and I'll eat it." No matter in what shape it comes, whether from the mouth of a king who seeks to bestride the people of his own nation and live by the fruit of their labor, or from one race of men as an apology for enslaving another race, it is the same tyrannical principle.
-- October 15, 1858 Debate at Alton, Illinois
Now what is Judge Douglas' Popular Sovereignty? It is, as a principle, no other than that, if one man chooses to make a slave of another man, neither that other man nor anybody else has a right to object.
--September 16, 1859 Speech in Columbus, Ohio
We know, Southern men declare that their slaves are better off than hired laborers amongst us. How little they know, whereof they speak! There is no permanent class of hired laborers amongst us ... Free labor has the inspiration of hope; pure slavery has no hope.
--ca. September 17, 1859 Fragment on Free Labor
You think slavery is right and ought to be extended; while we think it is wrong and ought to be restricted. That I suppose is the rub. It certainly is the only substantial difference between us.
--December 22, 1860 Letter to Alexander Stephens
I believe that Lincoln's own words reflect his personal confliction about slavery, however, he had to uphold the law.