Trade small because thats when you are as bad as you are ever going to be. Learn from your mistakes.

When things aren't going right, don't push, don't press.

When you are getting beat to death, get your head out of the mixer.

There is another point that I think is as important: You should expect the unexpected in this business; expect the extreme. Don’t think in terms of boundaries that limit what the market might do. If there is any lesson I have learned in the nearly twenty years that I’ve been in this business, it is that the unexpected and the impossible happen every now and then

Trading has taught me not to take the conventional wisdom for granted. What money I made in trading is testimony to the fact that the majority is wrong a lot of the time. The vast majority is wrong even more of the time. I've learned that markets, which are often just mad crowds, are often irrational; when emotionally overwrought, they're almost always wrong.

I could trade without knowing the name of the market.

Trading decisions should be made as unemotionally as possible.