But, dear brother, the apostle testifies, and I unworthy one also, that we wrestle not only against the rulers of the world, but also against the spirits that are under heaven (Eph. 6:12), and as Christ says, that in the latter days many false Christs shall arise. Matt. 24:5,11. This I have also espied for you; for in the time of my faith many false prophets or false Christians have assailed me; now they came with this fair appearance, now with another. But the Lord, who would have all men saved, delivered me from all this and I cleaved to the word of God, as I heard and accepted it in the beginning; and my faith weakened not, though many apostatized who had seemed to be the most valiant. See, thus our faith is tried in many ways, and besides by the daily conflict that never ceases, for it is a lasting conflict; the Spirit wars against the flesh, and the flesh against the Spirit. Gal. 5:17. Herein I find myself troubled the most; my own sinful flesh was my most inveterate enemy, which has cost me many a bitter tear. Satan thereby sought to sift me as wheat; but now falling, now stumbling, I have come thus far through the grace of God; for I always struggled up hard by the grace of the Lord. But what was it, I would so fain have been perfect, but this weak flesh was always in the way; which must now suffer, and I hope to offer it up as a burnt sacrifice.
Thus, my dearest brother, I have explained to you a little what conflict a Christian must wage, namely, against flesh and blood, against false spirits, who have laid their subtle arrows upon the bow, to shoot in secret at the pious. Hence take unto you the armor of God; that you may be able to stand against the subtle assaults of the devil; and be girded with the girdle of truth: above all, take the shield of faith, wherewith you shall be able to quench all the fiery darts of the wicked; and have your feet shod, so that you may always be well prepared for the gospel of peace; and take the helmet of salvation, the living hope, and the sword of the Spirit, which is the word of God; and pray always with all prayer and supplication. Ephesians 6:13–18. Behold, with these weapons of the Spirit we can overcome, and then the crown is promised us. But forget not that Jesus Sirach says: “My son, hast thou sinned? do so no more, but ask God for pardon for thy former sins. Flee from sin as from the face of a serpent; for if thou comest too near it, it will bite thee: the teeth thereof are as the teeth of a lion, slaying the souls of men. All iniquity is as a two-edged sword, the wounds whereof cannot be healed.” Sir. 21:1–3. Paul, too says: Mortify your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry. In short, live according to the Spirit, and you shall not fulfill the works of the flesh. Col. 3:5; Galatians 5:16. To this end the good God grant his grace, that you may grow up in faith, in love, and in the knowledge of our Lord Jesus Christ, so that you may become a perfect man, unto the measure of the stature of the fullness of Christ, and thus wait for the coming of Christ. Eph. 4:13.
O my dear brother, take care for your salvation; the time here is so short, and eternity is at hand. O heavenly Father, I humbly beseech thee, that thou wilt keep my only brother from all evil, and sanctify him in thy name through Christ Jesus, and ever guide him by the Holy Spirit, that we may rejoice together hereafter. Amen.