Paul Tudor Jones
Turned $1.5 million into $300 million in five years
“That cotton trade was almost the deal breaker for me. It was at that point that I said, “Mr. Stupid, why risk everything on one trade? Why not make your life a pursuit of happiness rather than pain?”
I had to learn discipline and money management. I decided that I was going to become very disciplined and businesslike about my trading. I spend my day trying to make myself as happy and relaxed as I can be.
If I have positions going against me, I get right out; if they are going for me, I keep them. I am always thinking about losing money as opposed to making money. Risk control is the most important thing in trading. I keep cutting my position size down as I have losing trades.

When I am trading poorly, I keep reducing my position size. That way, I will be trading my smallest position size when my trading is worst. If I have positions going against me, I get right out; if they are going for me, I keep them.
Risk control is the most important thing in trading. If you have a losing position that is making you uncomfortable, the solution is very simple: Get out, because you can always get back in. There is nothing better than a fresh start.
The most important rule of trading is to play great defense, not great offense.
Every day I assume every position I have is wrong. I know where my stop risk points are going to be. I do that so I can define my maximum possible draw down. Hopefully, I spend the rest of the day enjoying positions that are going in my direction. If they are going against me, then I have a game plan for getting out. Don’t be a hero. Don’t have an ego. Always question yourself and your ability. Don’t ever feel that you are very good. The second you do, you are dead. I know that to be successful, I have to be frightened. Don’t focus on making money; focus on protecting what you have.”