God’s patience with you is a good reason to have more patience with the slow driver in front of you.

Patience received and patience given come out of the same account, and most people run a serious deficit. You have been late, slow, and in somebody’s way, and you were mostly dealt with gently. Remembering that makes the car in front considerably less infuriating. Irritation at other people’s incompetence requires a short memory about your own.

Name the thing that reliably makes you snap: traffic, the queue, the sibling who takes forever. Next time it happens, think of one occasion when you were the slow one. Then let the moment pass without saying anything.