9 “Because there the Lord commanded blessing.” Where did He command it? Among the brethren who dwell together. There He enjoined blessing, there they who dwell with one heart bless God. For you bless not God in division of heart....Are you straitened on earth? Depart, have your habitation in heaven. How shall I, a man clothed in flesh, enslaved to the flesh, you will say, have my habitation in heaven. First go in heart, whither you would follow in the body. Do not hear, “Lift up your hearts,” with a deaf ear. Keep your heart lifted up, and no one will straiten you in heaven.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)