You believe that God is one. Good for you! Even the demons believe that—and shudder.
Σὺ πιστεύεις ὅτι ὁ Θεὸς εἷς ἐστί· καλῶς ποιεῖς· καὶ τὰ δαιμόνια πιστεύουσι, καὶ φρίσσουσι.