At any rate, it’s more argument for the taoist idea that worry is ultimately without purpose. Worrying over things you can’t change wastes energy since you can’t change them. Worrying over things you can is a waste of energy because it detracts from energy that could be spent in actually changing them. (agoodshinkickin's folk wisdom about “spit and wishes” presented a very similar idea.)
Sam arrived in Boston on Friday and so far it’s been a lot more relaxed than her visit over Christmas. I’m going to go out on a limb and say that it’s probably because I’m in a better state and, being less volatile, I’m not causing her to feel quite so on edge. Things are just far better when we’re just being ourselves and not agonizing over keeping each other happy or entertained.