As far as I'm concerned, patience is THE most important facet of playing poker. Read any book by guys like Harrington, Brunson, Ivey, etc, and they all say to be patient, and "the cards will come". It's true.
In the old no "late registration" days of PokerStars "Sunday Storm", I sat for 2 hours, and played one hand. Believe it, or not, it got me in the money, and after that the cards started coming, and I got a couple of hundred dollars out of it.
That was an extreme example of patience, because impatience will usually kick in, and when it does, I become an observer.