But if the Negro is a man, is it not to that extent a total destruction of self-government to say that he too shall not govern himself? When the white man governs himself, that is self-government; but when he governs himself and also governs another man, that is more than self-government—that is despotism. If the Negro is a man, why then my ancient faith teaches me that “all men are created equal,” and that there can be no moral right in connection with one man’s making a slave of another.[86]

Lincoln knew the type of argument he had to oppose, and he correctly gauged its force. It was the argument from circumstance, which he treated as such argument requires to be treated. “Let us turn slavery from its claims of ‘moral right’ back upon its existing legal rights and its argument of ‘necessity.’”[87] He did not deny the “necessity”; he regarded it as something that could be taken care of in course of time.

After the formation of the Republican Party, he often utilized his source in definition to point out the salient difference between Republicans and Democrats. The Democrats were playing up circumstance (the “necessity” alluded to in the above quotation) and to consequence (the saving of the Union through the placating of all sections) while the Republicans stood, at first a little forlornly, upon principle. As he put it during a speech at Springfield in 1857:

The Republicans inculcate, with whatever of ability they can, that the Negro is a man, that his bondage is cruelly wrong, and that the field of his oppression ought not to be enlarged. The Democrats deny his manhood; deny, or dwarf to insignificance, the wrong of his bondage; so far as possible crush all sympathy for him, and cultivate and excite hatred and disgust against him; compliment themselves as Union-savers for doing so; and call the indefinite outspreading of his bondage “a sacred right of self-government.”[88]

In the long contest with Douglas and the party of “popular sovereignty,” Lincoln’s principal charge was that his opponents, by straddling issues and through deviousness, were breaking down the essential definition of man. Repeatedly he referred to “this gradual and steady debauching of public opinion.” He made this charge because those who advocated local option in the matter of slavery were working unremittingly to change the Negro “from the rank of a man to that of a brute.” “They are taking him down,” he declared, “and placing him, when spoken of, among reptiles and crocodiles, as Judge Douglas himself expresses it.

“Is not this change wrought in your minds a very important change? Public opinion in this country is everything. In a nation like ours this popular sovereignty and squatter sovereignty have already wrought a change in the public mind to the extent I have already stated. There is no man in this crowd who can contradict it.

“Now, if you are opposed to slavery honestly, I ask you to note that fact, and the like of which is to follow, to be plastered on, layer after layer, until very soon you are prepared to deal with the Negro everywhere as with a brute.”[89]

We feel that the morality of intellectual integrity lay behind such resistance to the breaking down of genera. Lincoln realized that the price of honesty, as well as of success in the long run, is to stay out of the excluded middle.

In sum, we see that Lincoln could never be dislodged from his position that there is one genus of human beings; and early in his career as lawyer he had learned that it is better to base an argument upon one incontrovertible point than to try to make an impressive case through a whole array of points. Through the years he clung tenaciously to this concept of genus, from which he could draw the proposition that what is fundamentally true of the family will be true also of the branches of the family.[90] Therefore since the Declaration of Independence had interdicted slavery for man, slavery was interdicted for the negro in principle. Here is a good place to point out that whereas for Burke circumstance was often a deciding factor, for Lincoln it was never more than a retarding factor. He marked the right to equality affirmed by the signers of the Declaration of Independence: “They meant simply to declare the right, so that enforcement of it might follow as fast as circumstances would permit.”[91] And he recognized the stubborn fact of the institution of American slavery. But he did not argue any degree of rightness from the fact. The strategy of his whole anti-slavery campaign was that slavery should be restricted to the states in which it then existed and in this way “put in course of ultimate extinction”—a phrase which he found expressive enough to use on several occasions.