And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven. And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.

Revelation 12:7-9

>cast out into the earth

This means it is here on this world which God had originally created for you. Something went wrong in creation. Apparently, God has a plan for this.