You're allowed to disappoint people to keep a promise to yourself. That's not selfish. That's the only self worth being.

The thought behind it

It grants permission — not to be reckless, but to stop apologising for a want that was reasonable all along. It sits under Quiet Power because the hard part is doing it with no audience to confirm you were right. “disappoint” is doing the work: it is where the line stops describing you and starts asking something.