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.
Psalms 24:7-10
7
Lift up your heads, you gates! Be lifted up, you everlasting doors, and the King of glory will come in.
8
Who is the King of glory? Yahweh strong and mighty, Yahweh mighty in battle.
9
Lift up your heads, you gates; yes, Lift them up, you everlasting doors, and the King of glory will come in.
10
Who is this King of glory? Yahweh of Armies is the King of glory! Selah. By David.