What is the latin phrase "a true statement is true without regard to reliability of the speaker"?

Question

There is some kind of latin phrase or literature phrase to describe this, and it's NOT "ad hominem" I'm thinking about. It's a common phrase or saying in literature or logic.

Answer 1

maybe you are thinking of:
"Ipso facto"?
Latin for "by the fact itself." This term is used by Latin-addicted lawyers when something is so obvious that it needs no elaboration or further explanation. For example, it might be said that a blind person, ipso facto, is not qualified to obtain to a driver's license.