For faith, as well-intentioned as it may be, must be built on facts, not fiction - faith in fiction is a damnable false hope.

I haven't failed; I just found 10,000 ways that didn't work.

The three great essentials to achieve anything worthwhile are, first, hard work second, stick-to-itiveness third common sense.

There is no expedient to which a man will not go to avoid the labor of thinking.

I'd put my money on the sun and solar energy. What a source of power! I hope we don't have to wait until oil and coal run out before we tackle that.

Negative results are just what I want. They're just as valuable to me as positive results. I can never find the thing that does the job best until I find the ones that don't.

Until we stop harming all other living beings, we are still savages.

There is no substitute for hard work.

There is no substitute for your impassioned prayers on behalf of your children

Our greatest weakness lies in giving up.The most certain way to succeed is always to try just one more time.