Spiritual Meaning of REVELATION 20:15
AR 874. Verse 15.And if anyone was not found written in the book of life, he was cast into the lake of fire, signifies that they who did not live according to the Lord’s commandments in the Word, and did not believe in the Lord, were condemned. That by "the book of life" is signified the Word, and by "being judged out of that book,‘ is signified to be judged according to the truths of the Word, may be seen above (n. 256, 259, 295, 303, 309, 317, 324, 330); and no other is found written in the book of life but he who has lived according to the Lord’s commandments in the Word, and has believed in the Lord; this therefore is meant. That he who does not live according to the Lord‘s commandments in the Word, is condemned, the Lord teaches in John:--
And if anyone hear My words and believe not, I judge him not: he hath one that judgeth him, the Word that I have spoken, that shall judge him in the last day (John 12:47, 48).
And that he who does not believe in the Lord, is condemned, also in John:--
He that believeth on the Son hath eternal life, and he that believeth not the Son, shall not see life, but the anger of God abideth on him (John 3:36).