Mind Over Matter

I was reading through a friend's page in facebook. I found this :

be who you are and say what you feel , because those who mind don't matter and those who matter don't mind..

It is true? I guess there's no such thing as rules, what u should or shouldn't do, what to say and what not to say. I shall stop thinking too deep and take these words as an inspiration. And I hope you do too.

Love,

NR.