'The first resurrection,' mentioned in Revelation 20:5, 6, does not mean a first resurrection, but the essence and primary part of resurrection, which is salvation and eternal life. There is only one resurrection to life. A second does not happen, and is not mentioned anywhere in the Bible.

(References: Apocalypse Explained 6; Apocalypse Revealed 851; Revelation 20:5-6)

103. I saw a great dog, such as that called Cerberus by the most ancient writers; his jaws gaped horribly. It was said that such a dog means guarding, so that man should not pass from heavenly conjugial love to the infernal love of adultery. When the former love passes into that opposed to it, though the pleasure seems almost the same, then such a figure is presented to guard against the opposed pleasures communicating.