1 Cyprian to Nemesianus, Felix, Lucius, another Felix, Litteus, Polianus, Victor, Jader, and Dativus, his fellow bishops, also to his fellow presbyters and deacons, and the rest of the brethren in the mines, martyrs of God the Father Almighty, and of Jesus Christ our Lord, and of God our preserver, everlasting greeting. Your glory, indeed, would demand, most blessed and beloved brethren, that I myself should come to see and to embrace you, if the limits of the place appointed me did not restrain me, banished as I am for the sake of the confession of the Name.
But in what way I can, I bring myself into your presence; and even though it is not permitted me to come to you in body and in movement, yet in love and in spirit I come expressing my mind in my letter, in which mind I joyfully exult in those virtues and praises of yours, counting myself a partaker with you, although not in bodily suffering, yet in community of love. Could I be silent and restrain my voice in stillness, when I am made aware of so many and such glorious things concerning my dearest friends, things with which the divine condescension has honoured you, so that part of you have already gone before by the consummation of their martyrdom to receive from their Lord the crown of their deserts?
Part still abide in the dungeons of the prison, or in the mines and in chains, exhibiting by the very delays of their punishments, greater examples for the strengthening and arming of the brethren, advancing by the tediousness of their tortures to more ample titles of merit, to receive as many payments in heavenly rewards, as days are now counted in their punishments. I do not marvel, most brave and blessed brethren, that these things have happened to you in consideration of the desert of your religion and your faith; that the Lord should thus have lifted you to the lofty height of glory by the honour of His glorification, seeing that you have always flourished in His Church, guarding the tenor of the faith, keeping firmly the Lord's commands; in simplicity, innocence; in charity, concord; modesty in humility, diligence in administration, watchfulness in helping those that suffer, mercy in cherishing the poor, constancy in defending the truth, judgment in severity of discipline.
And that nothing should be wanting to the example of good deeds in you, even now, in the confession of your voice and the suffering of your body, you provoke the minds of your brethren to divine martyrdom, by exhibiting yourselves as leaders of virtue, that while the flock follows its pastors, and imitates what it sees to be done by those set over it, it may be crowned with the like merits of obedience by the Lord.
Source: The Epistles of Cyprian (New Advent)