If Satan can appear as an Angel of light how can any of you determine between Gods light & Satan's? Are you an expert on light based power's. You know I never could quite understand that verse, that Satan can trick you with a false goodness. Seems that the odds are stacked high against us, doesn't it?
There is light and there is Light, just as there is life and there is Life.
In the world, being born of the flesh light and life are simply the likeness of things on high (in the spiritual realm). But life as we know it, is not actual Life, but a slow death; and light is not Light, but shades of darkness - mere counterfeits of the real thing.
On the contrary, in the spirit realm of God, life is everlasting and there is no shadow of turning.
Thus, Satan operates with the limits of the world, which is life that is not Life and light which is not Light. In the world and only being born of the flesh, we know nothing more. But if we are born again of the spirit of God, we see life and darkness for what they are, and see what is not visible to the natural eye, but only in the spirit.