Stong poker is like wearing a seatbelt

you have to play/use it 100% of the time for it to truly be effective. I try to remind myself of that analogy when I lose a few bets playing a hand I am fairly certain I shouldn't have been playing in the first place. Not that it happens that often, but I guess the point is all those little "what the f..." plays add up in the long run, and sometimes in the shortrun too!