II. He expostulates with him for wishing to give up his office, which would imply distrust of God's promises.
But I am surprised, beloved, that you are so disturbed by opposition in consequence of offenses, from whatever cause arising, as to say you would rather be relieved of the labours of your bishopric, and live in quietness and ease than continue in the office committed to you. But since the Lord says, “blessed is he who shall persevere unto the end,” whence shall come this blessed perseverance, except from the strength of patience? For as the Apostle proclaims, “All who would live godly in Christ shall suffer persecution.”
And it is not only to be reckoned persecution, when sword or fire or other active means are used against the Christian religion; for the direst persecution is often inflicted by nonconformity of practice and persistent disobedience and the barbs of ill-natured tongues: and since all the members of the Church are always liable to these attacks, and no portion of the faithful are free from temptation, so that a life neither of ease nor of labour is devoid of danger, who shall guide the ship amidst the waves of the sea, if the helmsman quit his post?
Who shall guard the sheep from the treachery of wolves, if the shepherd himself be not on the watch? Who, in fine, shall resist the thieves and robbers, if love of quietude draw away the watchman that is set to keep the outlook from the strictness of his watch? One must abide, therefore, in the office committed to him and in the task undertaken. Justice must be steadfastly upheld and mercy lovingly extended. Not men, but their sins must be hated. The proud must be rebuked, the weak must be borne with; and those sins which require severer chastisement must be dealt with in the spirit not of vindictiveness but of desire to heal.
And if a fiercer storm of tribulation fall upon us, let us not be terror-stricken as if we had to overcome the disaster in our own strength, since both our Counsel and our Strength is Christ, and through Him we can do all things, without Him nothing, Who, to confirm the preachers of the Gospel and the ministers of the mysteries, says, “Lo, I am with you all the days even to the consummation of the age.” And again He says, “these things I have spoken unto you that in me you may have peace.
In this world you shall have tribulation, but be of good cheer, because I have overcome the world.” The promises, which are as plain as they can be, we ought not to let any causes of offense to weaken, lest we should seem ungrateful to God for making us His chosen vessels, since His assistance is powerful as His promises are true.
Source: Letters (New Advent)