6 “You sat on the throne Who judgest equity”. Whether the Son say this to the Father, who said also, “You could have no power against Me, except it were given you from above,” referring this very thing, that the Judge of men was judged for men's advantage, to the Father's equity and His own hidden things: or whether man say to God, “You sat on the throne Who judgest equity,” giving the name of God's throne to his soul, so that his body may perhaps be the earth, which is called God's “footstool:” for “God was in Christ, reconciling the world unto Himself:” or whether the soul of the Church, perfect now and without spot and wrinkle, worthy, that is, of the hidden things of the Son, in that “the King has brought her into His chamber,” say to her spouse, “You sat upon the throne Who judgest equity,” in that You have risen from the dead, and ascended up into heaven, and sittest at the right hand of the Father: whichsoever, I say, of those opinions, whereunto this verse may be referred, is preferred, it transgresses not the rule of faith.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)