490. The Word frequently uses a daughter to stand for good, as in David:

Daughters of kings are among your valued [friends]; the queen stands at your right hand in Ophir's best gold. The daughter of Tyre is among your tribute. All glorious is the king's daughter within [the palace]; her clothing is made of gold eyelet. In place of your forebears will be your sons. (Psalms 45:9-16)

The goodness and beauty of love and faith are being portrayed by a daughter here. That is why churches are called daughters — because of the good in them. The terms daughter of Zion and daughter of Jerusalem, for instance, are used in Isaiah 37:22 and in many other places. Churches are also referred to as "the daughter of [my] people" (Isaiah 22:4), "the daughter of Tarshish" (Isaiah 23:10), "the daughter of Sidon" (Isaiah 23:12), and "daughters in the field" (Ezekiel 26:6, 8).