The esteemed Richard Sibbes commenting on one proper use to be made in the way of mortification with the book of Canticles versus the misunderstanding/misapplication made of it by many (Works, Vol. 2, p.6):
By shewing more noble, excellent, and fit objects, that the soul, issuing more largely and strongly into them, may be diverted, and so by degrees die unto other things. The Holy Spirit hath chosen this way in this song, by elevating and raising our affections and love, to take it off from other things, that so it might run in its right channel. It is pity that a sweet stream should not rather run into a garden than into a puddle. What a shame is it that man, having in him such excellent affections as love, joy, delight, should cleave to dirty, base things, that are worse than himself, so becoming debased like them! Therefore the Spirit of God, out of mercy and pity to man, would raise up his affections, by taking comparison from earthly things, leading to higher matters, that only deserve love, joy, delight, and admiration. Let God’s stooping to us occasion our rising up unto him. For here the greatest things, the ‘mystery of mysteries,’ the communion betwixt Christ and his church, is set out in the familiar comparison of a marriage, that so we might the better see it in the glass of comparison, which we cannot so directly conceive of; as we may see the sun in water, whose beams we cannot so directly look upon. Only our care must be not to look so much on the colours as the picture, and not so much on the picture as on the person itself represented; that we look not so much to the resemblance as to the person resembled.