Here are some of Ali's own words to remember him by:
- “The man who views the world at 50 the same as he did at 20 has wasted 30 years of his life," he said in a 1975 issue of Playboy.
- "Float like a butterfly, sting like a bee. Rumble, young man, rumble," he said in 1964, before his fight with Sonny Liston.
- "What I suffered physically was worth what I've accomplished in life. A man who is not courageous enough to take risks will never accomplish anything in life," he said at a news conference on Oct. 28, 1984 in Houston.
- "Don't count the days. Make the days count," he said, according to ESPN.
- "I know where I'm going and I know the truth, and I don't have to be what you want me to be. I'm free to be what I want," he said.
- "When I feel pain, that’s when I start counting, because that’s when it really counts," he said.
For much more on Muhammad Ali, see TIME’s ALI: The Greatest, a 112-page, fully illustrated commemorative edition. Available at retailers and at AMAZON.COM