Post your favorite quotes

I found one today in the comments on Wil Wheaton's blog.

"Life is change. Growth is optional. Choose wisely."

So here are a few of my other favorite ones.

"Insanity: doing the same thing over and over again and expecting different results."
Albert Einstein (1879-1955)

"A good plan, violently executed now, is better than a perfect plan next week."
George S. Patton (1885 - 1945)

Okay I had one more but I can't find it. Ah well. Add yours and we'll have a party.