4834. 'And Judah said to Onan' means so as to preserve a representative of the Church. This is clear from the words which follow, since these here have regard to them. That is, he said that Onan was to perform for his brother the duty of a husband's brother, by which the preservation and continuation of the Church, to be discussed next, is represented.

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.