And my personal favorite, "Emotion is a contrarian indicator."
Added to my list.
"It's not how much you make it's how much you keep." Martin Zweig.
And: "Buy until you puke or puke until you buy. -or- Sell until you puke or puke until you sell."
Don't forget one of Will Rogers' most famous quotes: "If you want to make money in the stock market, take some money out of the bank and buy some stocks. And if they don't go up, don't buy them. There is a hell of a lot of truth to that even though he was obviously joking. If they start to go up THEN you buy them.