According to Christian interpretations, this verse can be understood as saying that if a young lady is strong and pure like a wall, she will be honored with something precious like silver. If she is open and welcoming like a door, she will be protected and cared for with strong materials like cedar wood.
Song of Solomon 8:9: 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 verse talks about a person’s lack of self-control being like a city broken down without walls, while Song of Solomon 8:9 suggests enclosing a person (likened to a wall) for protection, indicating a different approach to containment and structure.
Proverbs 25:28: He that [hath] no rule over his own spirit [is like] a city [that is] broken down, [and] without walls.