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
[Seite 7] κάρα, abgekehlt, abgeschnitten, Eur. Phoen. 458. – Aber λαιμότμητ' ἄχη, Ar. Thesm. 1054, = die Kehle zusammenschnürend.