ἀεί ποτ' εὖ μὲν ἀσκός εὖ δὲ θύλακος ἅνθρωπός ἐστι → this guy's always good at being a wineskin, and at times a winesack
-η, -ο (AM ἐπιστάμενος, -η, -ον)βλ. επίσταμαι.