“Siegfried walked over and put his arm round my shoulders. He was wearing his patient look again. ‘My dear chap,’ he cooed. ‘Just look at you. Red in the face, all tensed up. You mustn’t let yourself get upset like this; you must try to relax. Why do you think professional men are cracking up all over the country with coronaries and ulcers? Just because they allow themselves to get all steamed up over piffling little things like you are doing now. Yes, yes, I know these things are annoying, but you’ve got to take them in your stride. Keep calm, James, calm. It just isn’t worth it—I mean, it will all be the same in a hundred years.’”
—James Herriot, All Creatures Great and Small

Siegfried has a lot of good advice. Of course, he never follows it himself, but I can try.