I never failed once. It just happened to be a 2000-step process.

When you have exhausted all possibilities, remember this – you haven’t.

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

Five percent of the people think; ten percent of the people think they think; and the other eighty-five percent would rather die than think.

A little twist to the usual, “Everything comes to he who waits”. Everythingcomes to him who hustles while he waits.

Genius is one percent inspiration and ninety-nine percent perspiration.

Restlessness is discontent — and discontent is the first necessity of progress. Show me a thoroughly satisfied man — and I will show you a failure.

Study, along the lines which the theologies have mapped, will never lead us to discovery of the fundamental facts of our existence. That goal must be attained by means of exact science and can only...

There is no substitute for hard work.