Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense.

If knowledge is power and power is knowledge, then how so many idiots be graduating from college?

“Great thoughts speak only to the thoughtful mind, but great actions speak to all mankind.”

Start by doing what's necessary; then do what's possible; and suddenly you are doing the impossible.

The greatest discovery of any generation is that human beings can alter their lives by altering the attitudes of their minds.

Every child is an artist. The problem is how to remain an artist once he grows up.

Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution.