περικαλύψαι τοῖσι πράγμασι σκότον

From LSJ

γελᾷ δ' ὁ μωρός, κἄν τι μὴ γέλοιον ᾖ → the fool laughs even when there's nothing to laugh at

Source

English > Greek (Woodhouse Quotes Reversed)

to cast a veil of darkness over my deeds