Two important diabolic guises
The devil is a deceiver (Rev. 12:9). The apostle, Paul warns the Corinthians that the devil can disguise himself as “an angel of light” (2 Cor. 11:14). Paul is writing about the danger of false teachers who disguise themselves as “apostles of Christ” (2 Cor. 11:13). These “deceitful workmen” are agents of the great deceiver. False teaching, false gospel, and false teachers still persist and trouble the churches. This may be particularly so in the West.
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there is another guise that is not subtle at all. It shows itself in persecution. Peter uses a startling metaphor in application to the devil (1 Pet. 5):
“Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.”
Peter has persecution for the faith in mind as the next verse shows (1 Pet. 5:9):
“Resist him, firm in your faith, knowing that the same kinds of suffering are being experienced by your brotherhood throughout the world.”
There are many Christian brothers and sisters in non-western parts of the world who are experiencing the roaring lion - just as I write.
The whole article is here:
10 Things You Should Know about Demons and Satan
and it's also the part of the 10 Things You Should Know series.