I personally liked his views on time and life. It's really sad that Parkinson's effected him in what I feel is early in his life. In his long winded and sometimes seemingly crazy answers in interviews there are a lot of inspirational quotes.
During some rough patches I've used a few as encouragement, here are 10 of my favorite Muhammad Ali quotes:“I hated every minute of training, but I said, ‘Don’t quit. Suffer now and live the rest of your life as a champion.'”
He who is not courageous enough to take risks will accomplish nothing in life.
“Even when I knew people were cheating me, what was important was how I behaved, because I have to answer to God. I can't be responsible for other people's actions: They will have to answer to God themselves”
It isn't the mountains ahead to climb that wear you out; it's the pebble in your shoe.
Allah's the Arabic term for God. Stand up for God, fight for God, work for God and do the right thing, and go the right way, things will end up in your corner.
“Impossible is just a big word thrown around by small men who find it easier to live in the world they've been given than to explore the power they have to change it. Impossible is not a fact. It's an opinion. Impossible is not a declaration. It's a dare. Impossible is potential. Impossible is temporary. Impossible is nothing.”
“No one starts out on top. You have to work your way up. Some mountains are higher than others, some roads steeper than the next. There are hardships and setbacks, but you can't let them stop you. Even on the steepest road, you must not turn back. You must keep going up. In order to reach the top of the mountain, you have to climb every rock.”
“The best way to make your dreams come true is to wake up.”
“If they can make penicillin out of moldy bread, then they can sure make something out of you.”
“I try not to speak about all the charities and people I help, because I believe we can only be truly generous when we expect nothing in return.”