We still do not know one thousandth of one percent of what nature has revealed to us.

I don't know anything about music. In my line you don't have to.

I realized, 'Yo, I can't do anything in moderation. I don't know how.

From his neck down a man is worth a couple of dollars a day, from his neck up he is worth anything that his brain can produce.

I never did anything by accident, nor did any of my inventions come by accident; they came by work.

Anything that won't sell, I don't want to invent. Its sale is proof of utility, and utility is success.