7 It was my duty not to conceal these special matters, nor to hide them alone in my own consciousness—matters by which each one of us may be both instructed and guided. And do not you for your part keep this letter concealed among yourselves, but let the brethren have it to mad. For it is the part of one who desires that his brother should not be warned and instructed, to intercept those words with which the Lord condescends to admonish and instruct us. Let them know that we are proved by our Lord, and let them never fail of that faith whereby we have once believed in Him, under the conflict of this present affliction.
Let each one, acknowledging his own sins, even now put off the conversation of the old man. “For no man who looks back as he puts his hand to the plough is fit for the kingdom of God.” And, finally, Lot's wife, who, when she was delivered, looked back in defiance of the commandment, lost the benefit of her escape. Let us look not to things which are behind, whither the devil calls us back, but to things which are before, whither Christ calls us. Let us lift up our eyes to heaven, lest the earth with its delights and enticements deceive us.
Let each one of us pray God not for himself only, but for all the brethren, even as the Lord has taught us to pray, when He bids to each one, not private prayer, but enjoined them, when they prayed, to pray for all in common prayer and concordant supplication. If the Lord shall behold us humble and peaceable; if He shall see us joined one with another; if He shall see us fearful concerning His anger; if corrected and amended by the present tribulation, He will maintain us safe from the disturbances of the enemy. Discipline has preceded; pardon also shall follow.
Source: The Epistles of Cyprian (New Advent)