οὐκ ἂν λάβοις παρὰ τοῦ μὴ ἔχοντος → you can't take from one who doesn't have, you can't squeeze blood out of a turnip, you can't get blood out of a turnip, you can't get blood from a stone, you can't get blood out of a stone
P. and V. κομψός, πυκνός, ποικίλος, Ar. and P. χαρίεις.
not though the philosophy has been framed by subtlest wits: V. οὐδ' εἰ δι' ἄκρων τὸ σοφὸν ηὕρηται φρενῶν (Euripides, Bacchae 203).
