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
adj.
P. and V. ἄπειρος, Ar. and P. ἀπέραντος, V. μυρίος (also Plat. but rare P.). Inconceivable: P. and V. ἀμήχανος. The infinite, subs.: P. τὸ ἄπειρον (Arist.).
infīnītē: adv., v. infinitus.