5 We earnestly exhort as much as we can, dearest brother, for the sake of the mutual love by which we are joined one to another, that since we are instructed by the providence of the Lord, who warns us, and are admonished by the wholesome counsels of divine mercy, that the day of our contest and struggle is already approaching, we should not cease to be instant with all the people in fastings, in watchings, in prayers. Let us be urgent, with constant groanings and frequent prayers. For these are our heavenly arms, which make us to stand fast and bravely to persevere. These are the spiritual defences and divine weapons which defend us. Let us remember one another in concord and unanimity. Let us on both sides always pray for one another. Let us relieve burdens and afflictions by mutual love, that if any one of us, by the swiftness of divine condescension, shall go hence the first, our love may continue in the presence of the Lord, and our prayers for our brethren and sisters not cease in the presence of the Father's mercy. I bid you, dearest brother, ever heartly farewell.
Source: The Epistles of Cyprian (New Advent)