So the Robin Williams' movie "Hook" is one of my favorites. If you've read the original Peter Pan by Sir James Barrie, it's actually a really good sequel. It stays true to the old tale.
One of the things that Peter says is that his word is his I can remember learning the hard way that a promise is something you keep, and that breaking a promise is a terrible thing to do.
In Terry Goodkind's Sword of Truth series, a promise made by a wizard is something that they can make be true by acting on it before they even make it. Jennifer and I have enhanced promises by calling them "wizard's promises". They are guaranteed in our minds.
I have a few other promises out there:
When we became roommates, John and I promised never to pull pranks on each other. We also vowed never to talk politics in order to maintain our friendship.
To a girlfriend in college, I promised that if I ever got to Paris, I would contemplate Notre Dame and write a poem.
The hardest promise I have to keep is one to another girlfriend. When I was told that my feelings were too much for her, I said I wouldn't contact her unless she contacted me first.
I hold to that that promise like I do all of the ones I have given. All of them are important and I intend to keep my word no matter how difficult doing that may become.