The greatest invention in the world is the mind of a child.

I do not believe in the God of the theologians; but that there is a Supreme Intelligence I do not doubt.

I have not failed 700 times. I have not failed once. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.

There is no substitute for hard work.

It is remarkable to what lengths people will go to avoid thought.

Barring serious accidents, if you are not preoccupied with worry and you work hard, you can look forward to a reasonably lengthy existence.... Its not the hard work that kills, its the worrying that kills.

When there's no experimenting there's no progress. Stop experimenting and you go backward. If anything goes wrong, experiment until you get to the very bottom of the trouble.