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.

577. Twelve means faith, or those things in their entirety that belong to love and faith deriving from it. Many details from the Word may confirm this - the twelve sons of Jacob and their names, the twelve tribes of Israel, and the Lord's twelve disciples. These matters however will in the Lord's Divine mercy be dealt with later on, in particular in Genesis 29, 30.