And no marvel; for Satan himself is transformed into an angel of light.
All Commentaries on 2 Corinthians 11:14 Go To 2 Corinthians 11
Augustine of Hippo
AD 430
Satan sometimes transforms himself into an angel of light in order to test those who need testing or to deceive those who deserve deception. Nothing but the great mercy of God can save a man from mistaking bad demons for good angels and false friends for true ones and from suffering the full damages of this diabolical deception which is all the more deadly in that it is wily beyond words.