Τὸ γὰρ περισσὰ πράσσειν οὐκ ἔχει νοῦν οὐδένα → There is no sense in doing things beyond the usual measure
P. and V. ἀμαθής, ἄμουσος, Ar. and P. ἀπαίδευτος, P. ἀγράμματος.