Quote from TD80:
The problem is the intelligent/book smart person doesn't like to be wrong. I struggled with being wrong for a long time in trading, the mechanics of my methodology worked *most* of the time. There were setups that were textbook that would go wrong, and I kept my risk in check but the problem was that it would destroy my confidence. My thoughts were: my ingenius methodology fails on a textbook setup, something is wrong... the market is wrong... This is where things go waaay down hill, if you ever hear yourself saying "The market is wrong", it's time to either quit this business altogether, or take some time away from the market to regroup!
This so right on. I still have to fight with myself to follow my system and take the trade. I still have to review my stats and say to myself "ok, system is right with this equity 66.3% of the time, profit factor is "x", blah, blah.
It takes a somewhat intelligent, but especially an open minded person to come up with a system. Probably better off with an automaton to trade it and shut up!

