The only true wisdom is in knowing you know nothing.

There is only one good, knowledge, and one evil, ignorance.

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

Life is like riding a bicycle. To keep your balance, you must keep moving.

Anyone who has never made a mistake has never tried anything new.

The more I see, the less I know for sure.

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

Where there is shouting, there is no true knowledge.

Only a life lived for others is a life worthwhile.