Try? Try not.....do.
Yoda in Star Wars.
I think this one works better with the full quote from Yoda.
Do. Or do not. There is no try.
Then of course there is always the kill shot. "that is why you fail!"
From other great movies, I always like this one from Indiana,
"its not the years honey, it's the mileage"
But, outside the movie lines one of my favorites for life is this Churchill quote.
"If you find yourself going through Hell, keep going!" maybe most applicable for this board.