A promise

“A promise must never be broken” - Alexander Hamilton

I think that this statement means that every promise that you make should never be broken. When you say that you are going to say something you must do it. When you say that you're going to do something, whether or not you said promise, it’s still a promise. When you break a promise, you are breaking your word. You will feel disappointed if a friend was to break a promise so you shouldn’t break your promises either. An example of this can be when your friend promises that they will not spread your secret. If they were to break their promise and tell everyone about it, you will definitely be disappointed in your friend. If you don’t like it when people break promises they make with you then you should also keep your promises and be loyal to your word.