First do no harm. [Primum non nocere.]
More Latin Proverbs:
Treachery will eventually betray itself; though wary enough at first.Latin
Every innovation startles us more by its novelty than it benefits us by its utility.
Latin
Bear won't bite bear.
Latin
Clodius impeaches the adulterers!
Latin
God sends meat, but the Devil sends cooks.
Latin
Never too old to learn.
Latin