The unglossed headword phrase is the first half of a line (for the second half see under mu 1360) of Attic comedy -- Callias [kappa 213] fr.1 Kock, from the Atalante: "advantage is better than dishonour; drag the adulterer to the corner". Fragment taken up by collectors of proverbs (Diogenian 5.42, Zenobius 4.67, Macarius Chrysocephalus 5.13, Michael Apostolius 9.68). The proverb is vaguely connected to the passage from Sophocles discussed next.
[1] An approximation of Sophocles, Oedipus Tyrannus 889-894 (web address 1): "if he does not gain his advantage fairly, but works the unholy [deeds], or touches the untouchable [sanctities] in folly. Where such things occur, what man will think any more that he can ward off the arrows [of the gods] from his soul?" The original's ματᾴζων , "doing vain, foolish things", is misconstrued as ματαίων "of vain, foolish ones", and as the start of a new sentence.
[2] From the scholia thereto (892).