We work day after day, not to finish things; but to make the future better ... because we will spend the rest of our lives there.

Don't bring anything to me but trouble.

Do not bring me your successes; they weaken me. Bring me your problems; they strengthen me.

Great steps in human progress are made by things that don't work the way philosophy thought they should. If things always worked the way they should, you could write the history of the world from now on. But they don't, and it is those deviations from the normal that make human progress.

The Wright brothers flew right through the smoke screen of impossibility.

Action without intelligence is a form of insanity, but intelligence without action is the greatest form of stupidity in the world.

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