https://pinterest.com/pin/285345326374326909/?source_app=android
The promise is to convince someone that what we say will come true and will never be denied.
Like when we have a promise and we deliver to the people we love. Surely the promise is not merely to convince her alone, but more precisely to make our dear ones understand how sincerely we expect to be the real thing, and it will be done as well as possible with the promise.