"The great secret of success is to go through life as a man who never gets used to anything."

"We must all suffer one of two things: the pain of discipline or the pain of regret."

"It is not enough to be good; you must be good for something."

"The African is my brother—but he is my younger brother by several centuries."

"The greatest discovery of my generation is that a human being can alter his life by altering his attitudes."