23 And he is beginning to think of that same Heavenly felicity, and to reprove himself, because he has been a beast, and has longed for things earthly. “For what have I in Heaven, and from You what have I willed upon earth?”. By your voice I see that you have understood. He compared with his earthly will the heavenly reward which he is to receive; he saw what was there being reserved for him; and while thinking and burning at the thought of some ineffable thing, which neither eye has seen, nor ear heard, nor into the heart of man has ascended, he has not said, this or that I have in Heaven, but, “what have I in Heaven?” What is that thing which I have in Heaven? What is it? How great is it? Of what sort is it? “And,” since that which I have in heaven does not pass away, “from You what have I willed upon earth?”.. You reserve, he says, for me in Heaven riches immortal, even Yourself, and I have willed from You on earth that which even ungodly men have, which even evil men have, which even abandoned men have, money, gold, silver, jewels, households, which even many wicked men have: which even many profligate women have, many profligate men: these things as a great matter I have desired of my God upon earth: though my God reserves Himself for me in Heaven!
24. “My heart and my flesh has failed, O God of my heart”. This then for me in Heaven has been reserved, “God of my heart, and my portion is my God.” What is it, brethren? Let us find out our riches, let mankind choose their parts. Let us see men torn with diversity of desires: let some choose war-service, some advocacy, some various and sundry offices of teaching, some merchandise, some farming, let them take their portions in human affairs: let the people of God cry, “my portion is my God.” Not for a time “my portion;” but “my portion is my God for everlasting.” Even if I always have gold, what have I? Even if I did not always have God, how great a good should I have? To this is added, that He promises Himself to me, and He promises that I shall have this for everlasting. So great a thing I have, and never have it not. Great felicity: “my portion is God!” How long? “For everlasting.” For behold and see after what sort He has loved him; He has made his heart chaste: “God of my heart, and my portion is God for everlasting.” His heart has become chaste, for nought now God is loved, from Him is not sought any other reward. He that does seek any other reward from God, and therefore is willing to serve God, more precious does make that which he wills to receive, than Him from whom he wills to receive. What then, is there no reward belonging to God? None except Himself. The reward belonging to God, is God Himself. This he loves, this he esteems; if any other thing he shall have loved, the love will not be chaste. You are receding from the Fire immortal, you will grow cold, will be corrupted. Do not recede. Recede not, it will be your corruption, it will be your fornication. Now he is returning, now he is repenting, now he is choosing repentance, now he is saying, “my portion is God.” And after what sort is he delighted with that Same, whom he has chosen for his portion.
25. “Behold, they that put themselves afar from You shall perish”. He therefore departed from God, but not far: for “I have become as it were a beast,” he says, and “I am always with You.” But they have departed afar, because not only things earthly they have desired, but have sought them from demons and the Devil. “They that put themselves afar from You shall perish.” And what is it, to become afar from God? “You have destroyed every man that commits fornication away from You.” To this fornication is opposed chaste love. What is chaste love? Now the soul does love her Bridegroom: what does she require of Him, from Her Bridegroom whom she loves? Perchance in like manner as women choose for themselves men either as sons-in-law or as bridegrooms: she perchance chooses riches, and loves his gold, and estates, and silver and cattle and horses, and household, and the like. Far be it. He does love Him alone, for nought he does love Him: because in Him he has all things, for “by Him were made all things.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)