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If you don’t really mean it, is it even a promise?
What’s the point of making a promise if you aren’t going to keep it?
That’s half of the reason to make a promise in the first place.
The transfer of information or a task and the fulfillment of that given information or task.
In order to make a promise you must know full well that you intend to keep it.
Anything less is a disservice to the other person and yourself.