I have better use for my brain than to poison it with alcohol. To put alcohol in the human brain is like putting sand in the bearings of an engine.

I have not failed 10,000 times. I have succeeded in proving that those 10,000 ways will not work.

My mother was the making of me.

The stomach is the only part of man which can be fully satisfied. The yearning of man's brain for new knowledge and experience and for more pleasant and comfortable surroundings never can be completely met. It is an appetite which cannot be appeased.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

I never did anything worth doing entirely by accident. . . Almost none of my inventions came about totally by accident. They were achieved by having trained myself to endure and tolerate hard work.

Our greatest weakness lies in giving up.