15 That thirst of the Church, would fain drink up that man also whom you see. At the same time also, in order that you may know how many in the mixed multitude of Christians with their mouth do bless, and in their heart curse, this man having been a Christian and a believer returns as a penitent, and being terrified by the power of the Lord, turns him to the mercy of the Lord. For having been led astray by the enemy when he was a believer, long time he has been an astrologer, led astray, leading astray, deceived, deceiving, he has allured, has beguiled, many lies he has spoken against God, That has given to men power of doing that which is good, and of not doing that which is evil.
He used to say, that one's own will did not adultery, but Venus; one's own will did not manslaying, but Mars; and God did not what is just, but Jupiter; and many other blasphemous things, and not light ones. From how many Christians do ye think he has pocketed money? How many from him have bought a lie, to whom we used to say, “Sons of men, how long are you dull of heart, wherefore love ye vanity, and seek a lie”? Now, as of him must be believed, he has shuddered at his lie, and being the allurer of many men, he has perceived at length that by the devil he has himself been allured, and he turns to God a penitent.
We think, brethren, that because of great fear of heart it has come to pass. For what must we say? If out of a heathen an astrologer were converted, great indeed would be the joy: but nevertheless it might appear, that, if he had been converted, he was desiring the clerical office in the Church. A penitent he is, he seeks not anything save mercy alone. He must be recommended therefore both to your eyes and hearts. Him whom you see in hearts love ye, with eyes guard ye. See ye him, mark ye him, and wherever he shall have gone his way, to the rest of the brethren that now are not here, point him out: and such diligence is mercy; lest that leader astray drag back his heart and take it by storm.
Guard ye him, let there not escape you his conversation, his way: in order that by your testimony it may be proved to us that truly to the Lord he has been turned. For report will not be silent about his life, when to you he is thus presented both to be seen and to be pitied. You know in the Acts of the Apostles how it is written, that many lost men, that is, men of such arts, and followers of naughty doctrines, brought unto the Apostles all their books; and there were burned so many volumes, that it was the writer's task to make a valuation of them, and write down the sum of the price. This truly was for the glory of God, in order that even such lost men might not be despaired of by Him that knew how to seek that which had been lost.
Therefore this man had been lost, is now sought, found, led hither, he brings with him books to be burned, by which he had been to be burned, so that when these have been thrown into the fire, he may himself pass over into a place of refreshment. Know ye that he, brethren, once knocked at the Church door before Easter: for before Easter he began to ask of the Church Christ's medicine. But because the art wherein he had been practised is of such sort as that it was suspected of lying and deceit, he was put off that he might not tempt; at length however he was admitted, that he might not more dangerously be tempted.
Pray for him through Christ. Straightway today's prayer pour out for him to the Lord our God. For we know and are sure, that your prayer effaces all his impieties. The Lord be with you.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)