Lincoln was a supreme politician. He understood politics because he understood human nature.

There is a great deal of human nature in man.

They dared not peer down into their own natures, down into the feverish confusion that filled their minds with a kind of dense, acrid mist.

Human nature;Different Faces plus different likes equals different attitudes.

Man by nature is a selfish being because, he has been imbued by nature to think of self alone.

Human nature being what it is, they tried to go out the same way they came in ... That was the problem.