Matthew 6:23

Ἐὰν δὲ ὁ ὀφθαλμός σου πονηρὸς ᾖ, ὅλον τὸ σῶμά σου σκοτεινὸν ἔσται· εἰ οὖν τὸ φῶς τὸ ἐν σοὶ, σκότος ἐστί, τὸ σκότος πόσον;

But if your eye be evil, your whole body will be full of darkness. If then the light that is in you is darkness, how great is that darkness!