How do YOU know that you're good?

[Acesover8s]

Been on an up and down rollercoaster lately. Dropping 40 big bets in a game, and then turning around and winning a 100 player tournament. Then winning back 20 bets, then losing those back, etc.

I guess I have some issues maintaining confidence through the variances, although I do not feel that it affects my game any.

Beyond keeping good records, how do YOU know that you're a good player? What keeps you sleeping peacefully after burning your chips to the felt?

Thanks