It sees them as spoken by the daughters of Jerusalem who are said by Christ in the previous verse to bless and praise His bride. These are young believers in whom faith is weak and holiness just begun. They have joined themselves to the church and they are full of admiration for her. We felt quite unworthy of such company - and still do. The explanation for the true church is always and ever the grace of God.
Christians are like that.
They too dwell in the darkness of sin. Only in time does their election become manifest in effectual calling. Gospel light enters their hearts and changes their lives. True believers become more and more separated from the world in their conduct. Their knowledge and holiness are very imperfect in this life, as they will tell you, because sin abounds in them still.