Word.

Don't give your word lightly - and when you do give it with truth and meaning behind it.  It is one of the few things you own in its entirety.

You can have all the money and fame in the world but if you aren't someone who keeps your word then you have no worth.  Don't say you are going to do something and then not follow through and don't say you did something if you didn't (I find both of these especially irritating).

What a great feeling you get when your friends and family can trust that you are going to show up for them when you say you will because that has been your past practice and you are a person who places value on your word.

This is not to say that Ish doesn't happen that sometimes gets in the way of you following through - but don't have a bag of excuses or be one of those people that always has a story as to why you let someone down.  After a while those people stop listening to those excuses and you are the only one who thinks anyone actually believes them.