'To hide under an oak,' as in Genesis 35:4, signifies eternal rejection. 'Oak' signifies the sensory good and truth of the church, and consequently, the lowest part of the natural, which is either the truths and goods, or the falsities and evils of the natural level.

(Odkazy: True Christian Religion 200)

In general, mothers in the Bible represent the Lord's church on earth. In some cases "mother" more specifically refers to the truth of the church, the true teachings the church has about the Lord and about life. This makes sense if you think about it. Mothers are the vehicles through which new people are created; the church (in a broad sense) is the vehicle through which new ideas about the Lord and new good actions are created. And just as a mother is filled with love -- for her children and husband -- so also is the church filled with love, both for its ideas and uses and also for the Lord.