There came however a time when the Pope's suffering and emaciated body could bear no longer that charge which was so burdensome. He had been ill for many years, suffering from various ailments and especially from weakness of digestion, and he seems to have broken down altogether towards the year 601. Agelulphus thundering at his gates had completed what early fastings and the constant work of a laborious life had begun, and at sixty Gregory took to his bed, from which, as he complains in one of his letters, he was scarcely able to rise for three hours on the great festivals of the Church in order to celebrate Mass. He was obliged also to conclude abruptly that commentary on Ezekiel which had been so often interrupted, leaving the last vision of the prophet unexpounded, which he regretted the more that it was one of the most dark and difficult, and stood in great need of exposition. "But how," he says, "can a mind full of trouble clear up such dark meanings? The more the mind is engaged with worldly things the less is it qualified to expound the heavenly." It was from Ezekiel that Gregory was preaching when the pestilence which swept away his predecessor Pelagius was raging in Rome, and when, shutting the book which was no longer enough with its dark sayings to calm the troubles of the time, he had called out to the people, with a voice which was as that of their own hearts, to repent. All his life as Pope had been threaded through with the study of this prophet. He closed the book again and finally when all Rome believed that another invasion was imminent, and his courage failed in this last emergency. It is curious to associate the name of such a man, so full of natural life and affection, so humorous, so genial, so ready to take interest in everything that met his eyes, with these two saddest figures in all the round of sacred history, the tragic patriarch Job, and the exiled prophet, who was called upon to suffer every sorrow in order to be a sign to his people and generation. Was it that the very overflowing of life and sympathy in him made Gregory seek a balance to his own buoyant spirit in the plaints of those two melancholy voices? or was it the misfortunes of his time, so distracted and full of miserable agitation, which directed him at least to the latter, the prophet of a fallen nation, of disaster and exile and penitence?