In my journey I have found that you are your word.
People will stop believing you if you do not deliver what you say you will. This is similar to the old fable “The little boy who cried wolf”. In that story, the little boy kept crying out that there was a wolf… and there was not. When he cried out that there was a wolf… and there was, no one believed him and things did not turn out well.
When you say something, make sure your actions and deeds match up.
Things may change along the way causing you to veer from what you originally said. If you communicate the change of course you will still maintain your integrity and credibility.
Once you lose your credibility, it is almost impossible to fully regain it.
Watch what you say and make sure it lines up with what you do.