But since the devil's bride, Reason, that pretty whore, comes in and thinks she's wise, and what she says, what she thinks, is from the Holy Spirit, who can help us, then? Not judges, not doctors, no king or emperor, because [reason] is the Devil's greatest whore.
Notes from Wikiquote
Martin Luther's Last Sermon in Wittenberg … Second Sunday in Epiphany, 17 January 1546. Dr. Martin Luthers Werke: Kritische Gesamtausgabe. (Weimar: Herman Boehlaus Nachfolger, 1914), Band 51:126, Line 7ff