38 I ask you, my reader, what does a man, who writes these things before he comes, appear to you to be? An adversary, or an envoy? This is the man whom we may, indeed, call most pious, or most religious, and, to give the exact equivalent of the word, one devoted to the worship of God. This is the man of divine understanding, so influential, and of such dignity in gait and dress, that, like a spiritual Hippocrates, he is able by his presence to relieve the sickness of our souls, provided, however, we are willing to submit to his treatment.
If such is his medicine, let him heal himself, since he is accustomed to heal others. To us, that divine understanding of his is folly for the sake of Christ. We willingly remain in the sickness of our simplicity, rather than, by using your eye-salve, learn an impious abuse of sight. Next come the words: “The excellent intentions of your Holiness compel our prayers to the Lord night and day; and, as though those intentions were already perfectly realised, we offer our prayers to Him in the holy places, that He may give you a perfect reward, and bestow on you the crown of life.”
You do right in giving thanks; for, if Isidore had not come you would not now have found in the whole of Palestine such a faithful associate. If he had not brought you the aid he had promised beforehand, you would find yourself surrounded by a crowd of rustics incapable of understanding your wisdom. This very apology of which we are now speaking was dictated in the presence and, to a great extent, with the assistance of Isidore, so that the same person both composed the letter and carried it to its destination.
Source: To Pammachius Against John of Jerusalem (New Advent)