Why does the man call the woman “the only one of her mother”?
Song of Solomon 6:9 (ESV)
9My dove, my perfect one, is the only one, the only one of her mother, pure to her who bore her. The young women saw her and called her blessed; the queens and concubines also, and they praised her.
A mother knows her child as that specific child, one who is irreplaceable and for whom there is no substitute.1 The young man needs and desires only one woman. His dove, his perfect one, is the only one. She is utterly unique, belonging to him alone and she has no equal.2
9 My dove, my perfect one, is the only one, the only one of her mother, pure to her who bore her. The young women saw her and called her blessed; the queens and concubines also, and they praised her.