Apocalypse Explained #383
383. His name was Death, and Hell followed with him. That this signifies eternal damnation, appears from the signification of name, as denoting the quality of a thing (concerning which see above, n. 102, 148); here, the quality of the Word, [with those] who are in evils and the falsities thence; from the signification of death as denoting damnation (concerning which also see above, n. 186), for spiritual death is nothing else; from the signification of hell, as denoting evil and the falsity thence, because in these and from these hell exists. Furthermore, by hell is signified the same as by death, namely, damnation, but because both are here mentioned, and thus [hell] is distinguished from Death, by hell is signified eternal damnation; for those who come into hell remain there to eternity; therefore it is also said, "and Hell followed with him," to follow with him signifying to abide therein, namely, in damnation to eternity. From these considerations it is evident that by "his name was Death, and Hell followed with him," is signified eternal damnation.
The New Jerusalem and its Heavenly Teachings #238
238. People in whom love for themselves and love for the world are in control do not realize what heaven and heavenly happiness are. They cannot believe that happiness can be found in any kind of love other than self-love and love for the world. Yet the fact is that we feel the happiness of heaven to the extent that we put these loves aside as our goals. After these loves have been put aside, the happiness that follows is so great that it is beyond human comprehension.