Τὸ γὰρ περισσὰ πράσσειν οὐκ ἔχει νοῦν οὐδένα → There is no sense in doing things beyond the usual measure
Use adj., P. and V. πανοῦργος, κακοῦργος, V. παντουργός, λεωργός (also Xen. but rare P.), or use participles, P. and V. ὁ ἀδικῶν, ὁ ἁμαρτάνων.