If you personalize losses, you can't trade.

The first rule of trading - there are probably many first rules - is don't get caught in a situation in which you can lose a great deal of money for reasons you don't understand.

Place your stops at a point that, if reached, will reasonably indicate that the trade is wrong, not at a point determined primarily by the maximum dollar amount you are willing to lose

My experience with novice traders is that they trade three to five times too big. They are taking 5 to 10 percent risks on a trade when they should be taking 1 to 2 percent risks. The emotional burden of trading is substantial; on any given day, I could lose millions of dollars. If you personalize these losses, you can’t trade.

Michael [Marcus] taught me one thing that was incredibly important... He taught me that you could make a million dollars. He showed me that if you applied yourself, great things could happen. It is very easy to miss the point that you really can do it.

Whenever I enter a position, I have a predetermined stop. That is the only way I can sleep. I know where I'm getting out before I get in. The position size on a trade is determined by the stop, and the stop is determined on a technical basis... I never think about [stop vulnerability], because the point about a technical barrier - and I've studied the technical aspects of the market for a long time - is that the market shouldn't go there if you are right.

In 1983, I set up Caxton Corp. Its been an interesting and happy ride since.