Promise
A promise is a verbal agreement that both parties agree to complete. It can be based on business propositions or simple friendly gander.
Once a promise is made, it is upon you to complete it.
Promises kept is a sign of integrity.
I promised an art project with a dear friend many years ago; it's due time it was completed, although it might take another 30 years. As long as I complete it, my integrity is intact, and that is what is 🗝️.