'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)

17. These approximate or general explanations of the preceding words, not being presented in a continuous series, will seem disconnected; this is the result of each expression being explained separately, and of the subjoining of the internal sense to the sense of the letter, which is different, each being immediately considered apart. This however, does not happen with the angels, who are in the internal sense. These do not see the sense of the letter, nor do they know anything about it, but the internal sense only; and because they see this in the light of heaven, they see it in such a series, in such connection, and also in such fulness and, consequently, in such wisdom, as, cannot be expressed and described by any human words. The ideas of angels, being spiritual, also conjoin all the contents in a wonderful manner, and embrace more things than a man can conceive or express by his ideas, which are natural, even as to the thousandth part.