Insanity is doing the same thing, over and over again, but expecting different results.

Creativity is knowing how to hide your sources

If you are out to describe the truth, leave elegance to the tailor.

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.

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

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

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

Never attribute to malice that which can be adequately explained by stupidity.

One of the better definitions of insanity - doing the exact same thing over and over and expecting the result to be different.