I have a persisting nagging feeling that I'm misusing my twenties. I mean, I'm hardly pissing the years away, since teaching kids is a largely thankless and utterly philanthropic endeavour. But you need a strong stomach and even stronger convictions about why you're doing it. I suspect that my twenties should be more indulgent, more selfish, and I predict instead that philanthropy will probably make my post 30 era more meaningful. Give me ten years out of the job, and then let's see where I'm at.