Luck: A pure illusion that bad players think is responsible for their losing and which good players realize will only determine the outcome of their play in the short run.
Hold'em - like life itself - has its defining moment. It's the flop. When you see the flop, you're looking at 71 percent of your hand, and the cost is only a single round of betting. (Lou Krieger)
Sounds obvious, but it will save/make you a lot of money in time. Always take time to asses the situation before making your action. Autopilot is one of the best ways to lose money in poker.