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.

In Revelation 22:17, this signifies heaven and the church. It also signifies the church as to good and truth. (Apocalypse Explained 1189, Apocalypse Revealed 955)