In Zechariah 8:12, 'the vine shall give her fruit, and the ground her increase,' signifies that the spiritual affection of truth produces the good of charity, and the natural affection of good and truth produces the works of charity.

(Notae: Apocalypse Explained 695)

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.