Can Satan appear as an angel of light?
Yes. Satan can transform himself into an angel of light. He has authority and power, and he blinds the lost people of this world so they cannot comprehend the gospel. This is why believers must never forget that Satan is powerful and deceptive.
Les teaches that the word 'power' in this context is the same Greek word as in Ephesians, meaning authority, and that the principalities and powers have authority. He warns believers never to think twice about it or forget that Satan is powerful. Les points out that Satan can transform himself into an angel of light, and that he is the one who has the lost people of this world totally blinded, as 2 Corinthians says. It is through the power of Satan that they cannot comprehend the gospel. He also notes that this word 'power' is designated authority, and gives an example in Acts 26:10 where Paul received authority from the chief priests.