2 For we must comply with fitting intimations and admonitions, that the sheep may not be deserted in danger by the shepherds, but that the whole flock may be gathered together into one place, and the Lord's army may be arrived for the contest of the heavenly warfare. For the repentance of the mourners was reasonably prolonged for a more protracted time, help only being afforded to the sick in their departure, so long as peace and tranquillity prevailed, which permitted the long postponement of the tears of the mourners, and late assistance in sickness to the dying.
But now indeed peace is necessary, not for the sick, but for the strong; nor is communion to he granted by us to the dying, but to the living, that we may not leave those whom we stir up and exhort to the battle unarmed and naked, but may fortify them with the protection of Christ's body and blood. And, as the Eucharist is appointed for this very purpose that it may be a safeguard to the receivers, it is needful that we may arm those whom we wish to be safe against the adversary with the protection of the Lord's abundance.
For how do we teach or provoke them to shed their blood in confession of His name. if we deny to those who are about to enter on the warfare the blood of Christ? Or how do we make them fit for the cup of martyrdom, if we do not first admit them to drink, in the Church, the cup of the Lord by the right of communion?
Source: The Epistles of Cyprian (New Advent)