Matthew Poole and continuators on Song of Solomon 8:9

9 If she be a wall, we will build upon her a palace of silver: and if she be a door, we will inclose her with boards of cedar .

This seems to be Christs Answer to the foregoing question of the Jewish Church concerning their Sister Church of the Gentiles, for which they were very solicitous. Christ therefore engageth himself to take care of her, and to provide for her, as the matter doth require, and as suits best with her condition. If the Gentiles when they are converted shall be like a Wall, strong and firm in Faith, stedfast against all Assaults and Temptations, for a Wall in Scripture use signifies strength, Isa. 26. 1. Ier. 15. 20. and elsewhere; We, my Father, and I, and the Holy Ghost, as the principal Builders, and my Ministers as workers with, and under us, will build upon her a palace of silver, will add more strength and beauty to her, will enlarge and adorn her, make her more amiable in mine Eyes, and more visible and glorious in the Eyes of the World: And if she be as a Door, which is weaker than a Wall, and where the Enemy doth or may break in upon her, if she be weak in Faith, and somtimes overcome by the tempter, yet we will not therefore reject and forsake her, but we will enclose or (as many others render the word) strengthen or fortifie her with Boards of cedar, which are not only beautiful, but also strong, and durable. If she be sincere, and open the door of her Heart to me, though she be weak, I will come into her, and make her stronger.