Every now and then a man’s mind is stretched by a new idea or sensation, and never shrinks back to its former dimensions.

The difference between genius and stupidity is: genius has its limits.

Education is what remains after one has forgotten what one has learned in school.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

A little knowledge is a dangerous thing. So is a lot.

If the bee disappeared off the face of the earth, man would only have four years left to live.

Common sense is what tells us the earth is flat.

Not everything that can be counted counts.Not everything that counts can be counted.

God did not create evil. Just as darkness is the absence of light, evil is the absence of God.

To paraphrase Einstein, insanity is expecting employees to do one thing while rewarding them for doing something else.