Muhammed Ali and literary devices

I am the greatest.

Float like a butterfly, sting like a bee.

Silence is golden when you can't think of a good answer.

Last night I turned off the light switch and was in bed before the room was dark. 

If they can make penicillin out of mouldy bread, they can sure make something out of you. 

Cassius Clay is a name that white people gave to my slave master.

It isn't the mountains ahead to climb that wear you out; it's the pebble in your shoe.

I've handcuffed lightning, thrown thunder in jail.

The man who has no imagination has no wings.

I'm so mean I make medicine sick.

Service to others is the rent you pay for your room here on earth. 

I've seen George Foreman shadow boxing, and the shadow won.