Arcana Coelestia #335
335. A Summary of these matters is then presented: after separated faith, meant by Cain, had annihilated charity, new faith was provided by the Lord, by means of which charity was implanted. This faith is Seth, verse 25.
Arcana Coelestia #399
399. Verse 17 And Cain knew his wife, and she conceived and bore Enoch. And he was building a city, and he called the name of the city after the name of his son Enoch.
'Cain knew his wife, and she conceived and bore Enoch' means that this schism or heresy produced another from itself which was called 'Enoch'. 'A city that was built' means every detail of doctrine and heresy arising out of it. It is because that schism or heresy was called Enoch that the statement is made about the name of the city being called after the name of his son Enoch.