NEVER set a cash-out limit. When you double or tripile your buy-in, that's when things are going well. When you are winning, people see you as a winner. When people see you like that, they respect you. This lets you win more. It's kind of a perpetual cycle. Quit when you said you would stop. Quit when the table seems unfavorable. Quit after taking a bad beat that you won't be able to recover from. Quit after you've lost a little after winning a lot. But don't quit while you are winning, that's the best time to play poker.