Arcana Coelestia #486
486. Verse 4 And the days of Man after he beget Seth were eight hundred years; and he beget sons and daughters.
'Days' means periods of time and states in general. 'Years' means periods of time and states in particular. 'Sons and daughters' means the truths and goods that they perceived.
2 Peter 3:5
5
For this they willingly are ignorant of, that by the word of God the heavens were of old, and the earth standing out of the water and in the water:
