If you truly understood the math you wouldn't do it and there would be no emotion. No amount of time on the couch will explain why it's a bad idea. Once you are convinced it is a bad idea you won't do it anymore. If it falls in the discretionary area it is still math, but the math goes something like, "I sure have been taking a lot of small profits lately, better let this one ride so I don't get a bad reputation." See? It's still all based on math. How many times do you cheat compared to how many times you do it right. Then compute your cheat:honesty ratio and after a few honest trades you will have some free cheating trades to bring your ratio within the guidelines you have set for yourself. What? Me worry? Worry about what? Oh, you mean losing it all? Oh yeah, that sucks.