None of the quotes you provided can support an interpretation that Lincoln thought blacks intellectually or morally inferior. In fact, he said plainly during the debates that he didn't know that very thing.
And in the July 10 speech he said that all men were created equal.
Lincoln danced around this quite a bit in this time frame. He -was- a lawyer after all. But you can't put him on the record as saying blacks were inferior. And later he said:
"....peace does not appear as distant as it did. I hope it will come soon, and come to stay; and so come as to worth the keeping in all future time. It will have then been proved that, among free men, there can be no successful appeal from the ballot to the bullet; and that they who take such appeal are sure to lose their case, and pay the cost. And then, there will be some black men, who can remember that, with silent tongue, and clenched teeth, and steady eye, and well-poised bayonet they have helped mankind on to this great consumation; while, I fear, there will be some white ones, unable to forget that, with malignant heart, and deceitful speech, have strove to hinder it."
You'd rather be identified with the former than the latter, wouldn't you? I sure would.
Walt
In the same speech he added: "Anything that argues me into his idea of perfect social and political equality with the Negro is but a specious and fantastic arrangement of words, by which a man can prove a horse chestnut to be a chestnut horse.", And "free them, and make them politically and socially our equals? My own feelings will not admit of this . . . . We cannot, then, make them equals."
I am certain that you are familiar with these quotes, but would like to pretend you aren't. Well, here they are again.
Saul Sigelschiffer, The American Conscience: The Drama of the Lincoln-Douglas Debates (New York: Horizon, 1973) p. 281.