New Defender's Study Bible Notes
20:8 Gog and Magog. Despite the duplication of names, this Gog-and-Magog incursion after the thousand years does not seem to be the same as the invasion of Israel by Gog and Magog before the thousand years, as described in Ezekiel 38 and 39. The combatants in the two battles are quite different from each other and the outcomes are drastically different, as is obvious from even a casual reading of the two accounts. It may be that the names are the same because the new leaders of the rebellion (human leaders, that is) come from the same northern regions of Eurasia as the leaders of that earlier invasion of Israel. They may even have deliberately appropriated these Biblical names as a statement of their intent to avenge the defeat and death of their ancestors when they invaded Israel.
20:8 sand of the sea. The world population, with the benefit of increased longevity, as well as an almost perfect environment and societal conditions, will grow so much as actually to fulfill God’s ancient command to “fill the earth” (Genesis 9:1,7). But it is a sad commentary on the perverse depravity of human nature that, even after a thousand years of peace and prosperity, and even while experiencing the personal reign of Christ on the earth, men will still follow Satan when they have a chance, and do so in great multitudes! Truly, the human heart in its natural state is “deceitful above all things, and desperately wicked” (Jeremiah 17:9).