Song of Solomon 7:2 - Matthew Poole's English Annotations on the Holy Bible

Thy navel is like a round goblet, to which it is not unfitly compared, because it is of a round form, and hollow, and hath windings and circlings in it, which wanteth not liquor; thy navel is not only comely, but fruitful. For the navel is the proper instrument of nourishing the child or children which are in the womb. And so this seems to signify the church's fruitfulness, partly in herself, in cherishing and improving all the graces and good motions of God's Spirit within her; and principally in reference to those many children which she bears and feeds in her womb with the wholesome liquor of God's ordinances. Thy belly, in which thy children are for a time contained and fed, is like a heap of wheat, i.e. of wheat corn, round and swelling, as it is in women with child, and full of nourishment, not only of liquor, as was last said, but also of meat, which may note the various provisions which Christ hath laid up in his church according to the several capacities of her children, milk for babes, and stronger meat for those who are grown up. Set about with lilies; not for defence, which the church doth not need, having the strong God for her Protector, but for ornament and beauty; whereby is implied that she is not only fruitful, but beautiful, and that her children are not only numerous and well fed, but also comely and delightful to the eye, as lilies are, and withal pure and innocent, in which respect both Christ and the church are compared to lilies, Song of Solomon 2:1,2.