6 But the subject of enquiry is not only, that being a holy man he was sick, and sick so continually, but that he was at the same time entrusted with the public affairs of the world. For if he had been one of those who have retreated to the tops of mountains; who have fixed their cells in solitude, and who have chosen that life which is free from all business, the matter now enquired into were no such difficulty; but that one thrust forward in the throng, and in whose hands the care of so many Churches was placed, and who superintended whole cities and nations; nay, the world at large, with so much alacrity and diligence, should be subjected to the straitening of infirmities!
This it is which may most of all bewilder one who does not duly consider it. Because, even if not for himself, yet for others at least, it was necessary he should have health. “He was the best general,” says the objector. “The war was waged by him, not only against the unbeliever, but against demons, and against the devil himself. All the enemy contended with much vehemence, scattering the forces, and capturing prisoners; but this man was able to bring back myriads to the truth, and yet he was sick!
For if,” he says, “no other injury to the cause had come of this sickness, yet this alone was sufficient to discourage and relax the faithful. If soldiers, when they see their general detained in bed, become discouraged and slack for the fight, much rather was it probable that the faithful should betray somewhat of human nature, when they saw that teacher, who had wrought so many signs, in continual sickness and suffering of body.”
Source: Homilies on the Statues (New Advent)