7 No man loved Christ more than Paul: no man exhibited greater zeal, no man was counted worthy of more grace: nevertheless, after all these great advantages, he still has fears and tremblings concerning this government and those who were governed by him. “I fear,” he says, “lest by any means, as the serpent beguiled Eve through his subtlety, so your minds should be corrupted from the simplicity which is in Christ.” And again, “I was with you in fear and in much trembling;” and this was a man who had been caught up to the third Heaven, and made partaker of the unspeakable mysteries of God, and had endured as many deaths as he had lived days after he became a believer— a man, moreover, who would not use the authority given him from Christ lest any of his converts should be offended. If, then, he who went beyond the ordinances of God, and nowhere sought his own advantage, but that of those whom he governed, was always so full of fear when he considered the greatness of his government, what shall our condition be who in many ways seek our own, who not only fail to go beyond the commandments of Christ, but for the most part transgress them? “Who is weak,” he says, “and I am not weak? Who is offended and I burn not?” Such an one ought the priest to be, or, rather, not such only: for these are small things, and as nothing compared with what I am about to say. And what is this? “I could wish,” he says, “that myself were accursed from Christ for my brethren, my kinsmen according to the flesh.” If any one can utter such a speech, if any one has the soul which attains to such a prayer, he might justly be blamed if he took to flight: but if any one should lack such excellence as much as I do, he would deserve to be hated, not if he avoided the office, but if he accepted it. For if an election to a military dignity was the business in hand, and they who had the right of conferring the honor were to drag forward a brazier, or a shoemaker, or some such artisan, and entrust the army to his hands, I should not praise the wretched man if he did not take to flight, and do all in his power to avoid plunging into such manifest trouble. If, indeed, it be sufficient to bear the name of pastor, and to take the work in hand hap-hazard, and there be no danger in this, then let whoso pleases accuse me of vainglory; but if it behooves one who undertakes this care to have much understanding, and, before understanding, great grace from God, and uprightness of conduct, and purity of life and superhuman virtue, do not deprive me of forgiveness if I am unwilling to perish in vain without a cause.
Moreover, if any one in charge of a full-sized merchant ship, full of rowers, and laden with a costly freight, were to station me at the helm and bid me cross the Ægean or the Tyrrhene sea, I should recoil from the proposal at once: and if any one asked me why? I should say, “Lest I should sink the ship.” Well, where the loss concerns material wealth, and the danger extends only to bodily death, no one will blame those who exercise great prudence; but where the shipwrecked are destined to fall, not into the ocean, but into the abyss of fire, and the death which awaits them is not that which severs the soul from the body, but one which together with this dismisses it to eternal punishment, shall I incur your wrath and hate because I did not plunge headlong into so great an evil?
Source: On the Priesthood (New Advent)