Being on time is the cheapest way to prove you respect people.

Lateness communicates a ranking whether or not you intend it: your morning was worth more than their waiting. Almost nobody hears the reason, because the reason is different every time and the pattern is the only thing that registers. Punctuality requires no talent, no money, and no charm, which is precisely why it says so much.

Aim to arrive five minutes early rather than exactly on time, and build the buffer into the plan rather than the intention. If you are going to be late, send the message before the hour, not after. Treat other people’s time as the scarce thing it is.