Nobody can hurt me without my permission.

Logic will get you from A to Z, imagination will get you everywhere.

A journey of a thousand miles begins with a single step.

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

A clever person solves a problem. A wise person avoids it.

Whatever you are, be a good one.

I have no special talents. I am only passionately curious.

If you can't explain it to a six year old, you don't understand it yourself.

Only a life lived for others is a life worthwhile.