1 Cyprian to the people abiding at Thibaris, greeting. I had indeed thought, beloved brethren, and prayerfully desired—if the state of things and the condition of the times permitted, in conformity with what you frequently desired—myself to come to you; and being present with you, then to strengthen the brotherhood with such moderate powers of exhortation as I possess. But since I am detained by such urgent affairs, that I have not the power to travel far from this place, and to be long absent from the people over whom by divine mercy I am placed, I have written in the meantime this letter, to be to you in my stead.
For as, by the condescension of the Lord instructing me, I am very often instigated and warned, I ought to bring unto your conscience also the anxiety of my warning. For you ought to know and to believe, and hold it for certain, that the day of affliction has begun to hang over our heads, and the end of the world and the time of Antichrist to draw near, so that we must all stand prepared for the battle; nor consider anything but the glory of life eternal, and the crown of the confession of the Lord; and not regard those things which are coming as being such as were those which have passed away.
A severer and a fiercer fight is now threatening, for which the soldiers of Christ ought to prepare themselves with uncorrupted faith and robust courage, considering that they drink the cup of Christ's blood daily, for the reason that they themselves also may be able to shed their blood for Christ. For this is to wish to be found with Christ, to imitate that which Christ both taught and did, according to the Apostle John, who said, “He that says he abides in Christ, ought himself also so to walk even as He walked.” Moreover, the blessed Apostle Paul exhorts and teaches, saying, “We are God's children; but if children, then heirs of God, and joint-heirs with Christ; if so be that we suffer with Him, that we may also be glorified together.”
Source: The Epistles of Cyprian (New Advent)