243. And white garments, that thou mayest be clothed, signifies genuine truths and intelligence therefrom. This is evident from the signification of "white garments," as being genuine truths, for garments signify truths (See above, n. 195), and "white" signifies what is genuine, and is predicated of truths (See above, n. 196); also from the signification of "to clothe," as being to acquire intelligence for oneself therefrom, for by means of genuine truths all intelligence is acquired; for the human understanding is formed to receive truths, therefore it becomes such as the truths are out of which it is formed. It is supposed that understanding is also the ability to reason from thought and to speak from falsities, and to confirm falsities by many arguments; but this is not understanding, it is only a faculty granted to man with the memory to which it is adjoined, and of which it is an activity. Yet by means of this faculty the understanding is born and formed, so far as man receives truths from affection; but genuine truths it is not possible for any man to receive from affection except only from the Lord, since they are from Him; consequently, to receive understanding, or to become intelligent, is not given to any man, except only from the Lord, but it is given to everyone who applies himself to receive (according to what was said above, n. 239. This, therefore, is signified by "I counsel thee to buy of Me white garments, that thou mayest be clothed."

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.