I appreciate looking back on my 19-year-old self’s piece in praise of negativity because it highlights most the ways my views have changed since then. It’s not that I assess that specific situation differently: the Vector Marketing (Cutco) approach of getting desperate youth to sell knives to their families is an exploitative business model; working that job was bad and I don’t miss it one bit. But what’s in question is the lessons we draw from that situation.

Yes, we should be clear-eyed enough about the badness of our situations that we have an eye to changing them where possible. But what I didn’t realize then is the lesson of the Serenity Prayer: we also have to accept, and even be positive about, the bad things we cannot change. If we don’t do that – if we decide to see every 50% cup as half-empty – then we are undercutting our own goals.