A wise man speaks because he has something to say; a fool because he has to say something.
There are never failures -- only gained experience, wisdom, knowledge and lessons in life
One can resist the invasion of an army, but one cannot resist the invasion of ideas.
I think, therefore I am.
A good traveler has no fixed plans, and is not intent on arriving.
Learning is the only thing the mind never exhausts, never fears, and never regrets.
I never teach my pupils. I only attempt to provide the conditions in which they can learn.
It's not who you are that holds you back, it's who you think you're not.
It has become appallingly obvious that our technology has exceeded our humanity.
Make things as simple as possible but no simpler.