You’ll never know which tiny favor somebody still remembers ten years later. Do more of them.

You are a bad judge of which of your own actions mattered. The thing you remember is rarely the thing the other person kept, and the small stuff you did without thinking tends to be what lasted: a seat saved, a message at the right hour, a ride home. Since you cannot predict which ones land, the only sensible move is volume.

Do three small ones this week that cost under a pound and under five minutes. Lend the charger, save the seat, send the note. Then forget about them; the point is not keeping score.