Cat gre 14b21-22(21) τῷ γὰρ εἶναι τὸ πρᾶγμα ἢ μὴ ἀληθὴς ὁ λόγος ἢ ψευ(22)δὴς λέγεται.
Ackrill 1963 engfor the truth or falsity of the proposition depends on the fact of the man’s being or not being.
http://www2.hf.uio.no/common/apps/permlink/permlink.php?app=polyglotta&context=record&uid=ab43d3c0-bb72-11e4-bbf3-001cc4ddf0f4