"Never count your money when you're sittin at the table."
It's sounds sort of cheesy, but it's actually really relevant. We all have a tendency to be emotionally attached to the money in our stack. We win several huge pots and want to protect it by playing tighter, folding more or leaving the table. Or maybe we check our pokertracker or holdem manager results in the middle of our session to 'see how much we're up.' When we do this we're allowed our results to dictate how we feel. We're saying to ourselves that when we win a lot of money we've played well and when we lose a lot we haven't played well. However, we all know that some days no matter how well we play the cards just don't fall our way and we're going to lose. Conversely, some days when we win a lot we've made bad decisions and have just gotten really lucky. We need to be able to put the monetary amount aside and just make the best decision possible in every scenario.