God at the beginning of times created the Heavens and the Earth which means they both belong to him. God dwelt in the Heavens but desired that earth will be the colony of Heaven and that its order will be defined by the order of God in Heaven. The way he intended to do this is that there must be a warden or governor in the earth who will reflect him and his order to other inhabitants of the earth and this is the way God usually moves even till this day.