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 916] τό, dim. von σπάθη, kleine Spatel, σπαθίοις πηνίσματα κρούειν Ep. ad. 82 (VI, 283).