Ali, Muhammad

"The man who views the world at 50 the same as he did at 20 has wasted 30 years of his life."

"The fight is won or lost far away from witnesses - behind the lines, in the gym and out there on the road, long before I dance under those lights."

"The man who has no imagination has no wings."

"It's just a job. Grass grows, birds fly, waves pound the sand. I beat people up." - quoted in New York Times