"As a Trader (Man) Thinketh So Is He" side note - saying that you are the best is not enough - you really honestly must believe it too.
This was put in an earlier thread but I'll run it again here. Here it is: http://www.youtube.com/watch?v=kAlQc6keOgA "I'm the Juggernaut, bitch!"
Excellent quote and book. There are some great quotes on this blog, most of them applicable to trading: http://www.thetadprinciple.blogspot.com/