Here's a lovely quote from the preface of Ultimate - Techniques & Tactics by James Parinella and Eric Zaslow
Resolve yourself to becoming a good player. Good players chase down swill. Good players clear out. Good players cut when they're tired. Good players remember the defense. Good players call for help when they need it. In fact, "good" players are great players. Great teams also require great teammates. Become a great teammate. Be ready to play on time. Critique but don't criticize your teammates. Apologize for your mistakes. Take yourself out of the game when you're tired. Eschew pride.