Is it true, Is it kind, Is it necessary?

I picked this up in a meeting the other day. It wasn't the first time I heard it but it was the first time it stuck. I thought we should all have this tatooed on the inside of our forearms where we could consult it before saying anything to anybody. Usually what I say is true. I don't lie on purpose anymore. But the "kind" part is probably something I should work on. And the "necessary?" Wow I REALLY need to work on that. I wonder if even 50% of what I say is actually necessary. I think these questions are really designed to help people stop before they "straighten somebody out." But they're applicable to communication in general.