μὴ κακὸν εὖ ἔρξῃς· σπείρειν ἴσον ἔστ' ἐνὶ πόντῳ → do no good to a bad man; it is like sowing in the sea
(see also: ὑποφαίνω) just appear
subter apparere, to appear below, 5.10.2.