Язы́к мой —
враг мой, пре́жде ума́ глаго́лет.
Literal: My tongue is enemy mine, speaks ahead of mind.
A fool’s tongue runs before his wit.
Disclaimer: Thought I should qualify this one, doing a search in google, Joe Biden’s picture kept popping up under this quote. Wasn’t going to use it at first, but it is what it is. So………….