Hateful to me, as the gates of Hell, is that man who hides one thing in his heart, but speaks another.

ἐχθρὸς γάρ μοι κεῖνος ὁμῶς Ἀΐδαο πύλῃσιν / ὅς χ’ ἕτερον μὲν κεύθῃ ἐνὶ φρεσίν, ἄλλο δὲ εἴπῃ.

Homer, Iliad 9.312-3