The world was now God's "territory" because he shaped it the way he wanted. The idea still continues as we consider the Earth and the sky's location to be Heaven and we consider Hell to be located underneath Earth. Furthermore, it is known that Heaven is ruled by God and Hell is ruled by Satan.
As Satan talks during the opening scene, he decides he is now evil and if he could not destroy God, he will at least divide the kingdom. Satan's face color changes as he channels out his emotions in his speech. The archangel, Uriel, notices this from a distance and knows that Satan is not at peace. Since he was not at peace, he was not a cherub and he was disguised as one in the moment. Milton uses symbolism frequently in the book to have the reader connect different parts of the overall story to each other. Satan says, "O sun, to tell thee how I hate thy beams, That bring to my remembrance from what state I fell, how glorious once above thy sphere" (4.37-39). Here Milton uses the sun beams as a symbolism of God's light. As mentioned in the line, Satan hated the beams because they reminded him of how he was once great alongside the creator of Earth, God. Also, in the same line even Satan mentions Heaven to be located "above the sphere." Milton was referring to Earth as the sphere, then showing Heaven's place to be above it. As he saw these beams, Satan began to regret what he had done. People may do wrong and feel like they can get away with it and not have to think about it again. The author uses this side of Satan to demonstrate how someone may get away with evil or wrong-doing for the moment, but a guilty conscious always comes back around to make people realize what they have done is not right. A guilty conscious is another humanlike characteristic Satan had during this moment.
Throughout the whole poem, a motif of light and dark is presented between God and Satan. Heaven is presented on the light side when Milton talks about the sun and its beams in lines 37-39 and its brightness in line 44.