This Psalm gives us the desires of David in the government of His house-its principles, for it is the representation of Jehovah. “I will sing the mercy and the judgment; unto thee, 0 Lord, will I sing." Behold the principles of my conduct, the ground on which I act! It is His representation of His conduct unto the Lord. “When wilt thou come to me?” It appears to me that this alludes to the Solomon reign of Christ, in which the glory of the Lord should fill the house; meanwhile He is acting on all the perfect principles of that glory.
In this Psalm David takes His house and waits only for Jehovah to be set up in it, for Christ is set King in Zion by Jehovah, and as His King, so that it is ever Jehovah's kingdom; when Christ's, the character of earthly righteousness acted on in detail, is presented before the Lord as the manner of His conduct when He takes the house—so with Christ in the land.