We know how to speak many falsehoods which resemble real things, but we know, when we will, how to speak true things.
ἴδμεν ψεύδεα πολλὰ λέγειν ἐτύμοισιν ὁμοῖα,
ἴδμεν δ᾿, εὖτ᾿ ἐθέλωμεν, ἀληθέα γηρύσασθαι.
ἴδμεν δ᾿, εὖτ᾿ ἐθέλωμεν, ἀληθέα γηρύσασθαι.
Original text (Ancient Greek)
Notes from Wikiquote
Perhaps we know to tell many fictions like to truths, and we know, when we will, to speak what is true. | We know how to tell many lies that pass for truth, and we know, when we wish, to tell the truth itself.