I am 67, but I'm not too old to make a fresh start.

Genius is 99% perspiration and 1% inspiration.

If we did all the things we are capable of doing, we would literally astound ourselves.

An average American loves his family. If he has any love left over for some other person, he generally selects Mark Twain.

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.

I've realized that most of my best ideas have followed a good night's sleep.

I am proud of the fact that I never invented weapons to kill.