People are very open-minded about new things - as long as they're exactly like the old ones.

Education is man's going forward from cocksure ignorance to thoughtful uncertainty.Where there is an open mind there will always be a frontier.

All human development, no matter what form it takes, must be outside the rules; otherwise we would never have anything new.

My definition of an educated man is the fellow who knows the right thing to do at the time it has to be done. You can be sincere and still be stupid.

In America we can say what we think, and even if we can't think, we can say it anyhow.

The price of progress is trouble.

Nothing ever built arose to touch the skies unless some man dreamed that it should, some man believed that it could, and some man willed that it must.