8 “The heavens have declared His righteousness: and all the people have seen His glory”. What heavens have declared? “The heavens declare the glory of God.” Who are the heavens? Those who have become His seat; for as God sits in the heavens, so does He sit in the Apostles, so does He sit in the preachers of the Gospel. Even thou, if you will, shall be a heaven. Do you wish to be so? Purge from your heart the earth. If you have not earthly lusts, and hast not in vain uttered the response, that you have “lifted up your heart,” you shall be a heaven. “If you be risen with Christ,” says the Apostle to believers, “set your affection on things above, not on things of the earth.” You have begun to set your affection upon things above, not on things upon earth; have you not become a heaven?
Thou carriest flesh, and in your heart you are already a heaven; for your conversation will be in heaven. Being such, thou also declarest Christ; for who of the faithful declares not Christ?...Therefore the whole Church preaches Christ, and the heavens declare His righteousness; for all the faithful, whose care it is to gain unto God those who have not yet believed, and who do this from love, are heavens. From them God thunders forth the terror of His judgment; and he who was unbelieving trembles, and is alarmed, and believes.
He shows unto men what power Christ had throughout the world, by pleading with them, and leading them to love Christ. For how many this day have led their friends either to some pantomimist, or flute-player? Why, except from their liking him? And do ye love Christ. For He who conquered the world has exhibited such spectacles, as that no man can say that he finds in them cause for blame. For each person's favourite in the theatre is often vanquished there. But no man is vanquished in Christ: there is no reason for shame. Seize, lead, draw, whom you may: be without fear, you are leading unto Him, who displeases not those who see Him; and ask ye Him to enlighten them, that they may behold to good account.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)