It dawned on me the other day that I started teaching ten years ago. I still sometimes feel like I don't know what I'm doing, though of course the experience makes it easier to roll with the punches. I can objectively see that I'm better at teaching than a lot of other people; but this requires a comparatively large proportion of my time, and I often wonder whether it would even be possible to (competently) teach a full-time college load (nevermind a high school teaching load!) putting in just 40 hours a week. If it is, I wouldn't mind being let in on the secret.
"Each kid takes their turn letting the quirks and imperfections of their peers roll off them with a mutter of that phrase, before they all come together for a moment of pure Christmas spirit. So this year, when your family members inevitably do something that chafes, try to let it pass through you with a sigh of 'good grief'." --Jonathan Prykop