Arcana Coelestia #436
436. 'Her son whose name she called Seth' means new faith, through which charity may be received. This is clear from what has been stated already and also from where Cain is spoken of as having 'a sign placed on him lest anyone should kill him'. In the present context the meaning is this: Faith separated from love was meant by 'Cain', charity by 'Abel'. The annihilation of charity by separated faith was meant by Cain's killing Abel, and the preservation of faith, for the reason that through it charity could be implanted by the Lord, was meant by the statement about 'Jehovah putting a sign on Cain lest anyone should kill him'. After that, the Lord's conferment, through faith, of the holiness of love, and of good deriving from it, was meant by 'Jabal whom Adah bore'; and the conferment of the spiritual manifestation of faith by 'his brother Jubal'; and the existence of natural good and truth from these is meant by 'Tubal-cain whom Zillah bore'. These two verses conclude and so summarize all these matters; 'the man and his wife' means that new Church which was earlier on called Adah and Zillah, while Seth means faith through which charity is implanted. In the next verse Enosh means charity that has been implanted through faith.
Arcana Coelestia #780
780. 'Of all flesh in which there was the spirit of life 1 means a new creature, or the fact that they received new life from the Lord. This becomes clear from the meaning of 'flesh' as all mankind in general and a bodily-minded person in particular, as stated and shown already. Consequently 'flesh in which there was the spirit of life' 1 means a person who has been regenerated, for the Lord's life, which is the life of charity and faith, is there within his proprium. Nobody is anything more than flesh, but when the life of charity and faith is breathed into him by the Lord, his flesh in that case is made alive, becomes spiritual and celestial, and is called 'a new creature', Mark 16:15, from having been created anew.
Footnotes:
1. literally, of lives