3 Pray, are you not aware that that body is subject to more diseases and assaults than this flesh of ours, is more quickly corrupted, and more slow to recover? And by those who have the healing of these bodies, various medicines have been discovered, and an apparatus of different instruments, and diet suitable for the sick; and often the condition of the atmosphere is of itself enough for the recovery of a sick man; and there are instances of seasonable sleep having saved the physician all further labor.
But in the case before us, it is impossible to take any of these things into consideration; nay there is but one method and way of healing appointed, after we have gone wrong, and that is, the powerful application of the Word. This is the one instrument, the only diet, the finest atmosphere. This takes the place of physic, cautery and cutting, and if it be needful to sear and amputate, this is the means which we must use, and if this be of no avail, all else is wasted; with this we both rouse the soul when it sleeps, and reduce it when it is inflamed; with this we cut off excesses, and fill up defects, and perform all manner of other operations which are requisite for the soul's health.
Now as regards the ordering of our daily life for the best, it is true that the life of another may provoke us to emulation. But in the matter of spurious doctrine, when any soul is diseased thereby, then there is great need of the Word, not only in view of the safety of our own people, but in view of the enemy without. If, indeed, one had the sword of the spirit, and the shield of faith, so as to be able to work miracles, and by means of these marvels to stop the mouths of impudent gainsayers, one would have little need of the assistance of the Word; still in the days of miracles the Word was by no means useless, but essentially necessary.
For St. Paul made use of it himself, although he was everywhere so great an object of wonder for his miracles; and another of those who belonged to the “glorious company of the Apostles” exhorts us to apply ourselves to acquiring this power, when he says: “Be ready always to give an answer to every man that asks you a reason concerning the hope that is in you,” and they all, with one accord, committed the care of the poor widows to Stephen, for no other reason than that they themselves might have leisure “for the ministry of the Word.” To this we ought equally to apply ourselves, unless indeed we are endued with a power of working miracles.
But if there is not the least sign of such a power being left us, while on every side many enemies are constantly attacking us, why then it necessarily follows that we should arm ourselves with this weapon, both in order that we may not be wounded ourselves with the darts of the enemy, and in order that we may wound him.
Source: On the Priesthood (New Advent)