An honest no can do more for a goal than another ambitious yes.

Every yes can look generous in isolation. The cost becomes visible later, when several promises arrive together and compete for the same attention. At that point, the people you meant to help may experience your generosity as delay.

A clear no can protect the promises you have already made. It need not include a courtroom defense of your priorities. Where an explanation is useful, make it honest and proportionate. Leaving someone able to plan is a form of consideration too.

Which existing promise would be better served by declining the next request?