No wonder, for even Satan disguises himself as an angel of light.
t. 2 Cor. 11:14
Satan as an angel of light flies in the face of the modern perception of who Satan is. Since the angel's job is to "render service for the sake of those who would inherent salvation" (Heb. 1:14) we can observe Satan not as being the opposite of God (the virgin duelist take) but rather to be the antithesis of the angel's prescribed job. Satan's sin was wanting to be like God, but the result of his fall was opposing his own nature. This to is true of his followers, they oppose their purpose and exchange it for one the opposite thereof. But in terms of Satan presenting himself as an angel of light, this completely changes the mindset of how we ought to perceive good and evil. Never is it to be understood that evil originates from Satan, however we can observe that evil will do (if we can anthropomorphize evil) everything in its power to be as close to good as possible. The old adage "in ever lie there is a kernel of truth" is only partly true. We ought rather to say "every lie is but a kernel blanketed in truth". In other words the goal of evil, deception, etc. is to be as close to good while being a parody of it. With this knowledge one is much better equipped to ascertain good and evil. One also must be on much better guard because our perception of good and evil is greatly flawed. This is evidenced by the opening sentences of our perception of good and evil, and why Satan presenting himself as an angel of light is so opposing to our nature. The traditional Christian tendencies to label good and evil as black and white become blurred. Paul goes onto say in 2 Cor. 15: "Therefore it is not surprising if his servants also disguise themselves as servants of righteousness, whose end will be according to their deeds." We see how these men whom he is referring to are doing good deeds, but their motives are what makes their works evil, not the works themselves.