"He was one of the world's greatest men, and was made great by one single rule. Oh, that all the young people of Philadelphia were before me now and I could just say this one thing, and that they would remember it. I would give a lifetime for the effect it would have on our city and on civilization. Abraham Lincoln's principle for greatness can be adopted by nearly all. This was his rule: Whatsoever he had to do at all, he put his whole mind into it and held it there until that was all done. That makes men great almost anywhere."
Russell Conwell, Acres of Diamonds