"YOU ALWAYS WANT TO BE ABLE TO COME BACK AND PLAY THE NEXT DAY."

YOU ALWAYS WANT TO BE ABLE TO COME BACK AND PLAY THE NEXT DAY. Never put yourself in the precarious position of losing more money than you can afford. The worst feeling in the world is wanting to trade and not being able to do so because the equity in your account is too low and your brokerage firm will not allow you to continue unless you submit more funds.
The most important rule is survival. If you don't survive, you can't keep on playing.