The priest ONLY knows what I tell him, that is, his words are because of what I confessed. He can know nothing more of any penitent than what s/he tells him.
The priest is governed by the Ten Commandments...and God told us those. God determined our conscience many thousands of years ago.
His correctness follows those Ten Commandments, nothing more or nothing less.
I see.
If there is a list of actions that someone is not supposed to do, yet they want to...they have a malformed conscience...according to those that follow the list.