(Matthew 7:15-20)
Christ suggests that in every age there will be those who care for the fleece more than for the flock, and who come into the fold under a most winsome and bewitching guise. Beware of such people, and judge them, not by their doctrine, but by their fruits.
The Devil is the most orthodox theologian in the world.
"I will say of the LORD, 'He is my refuge and my fortress, my God in whom I trust'."
Psalm 91: 2