Make your word an asset.

An asset is something that produces value over time without being spent. A reputation for meaning what you say works exactly that way: it makes people say yes faster, extend more trust, and take you at your word in situations where others need proof. It is built slowly and can be spent all at once.

Protect it accordingly. Be careful what you promise, and treat every casual commitment as part of the balance. It is one of the few assets that cannot be bought.