Cyprian : But for the rest, let our most beloved brethren firmly decline, and avoid the words and conversations of those whose word creeps onwards like a cancer; as the apostle says, "Evil communications corrupt good manners." And again: "A man that is an heretic, after one admonition, reject: knowing that he that is such is subverted, and sinneth, being condemned of himself." And the Holy Spirit speaks by Solomon, saying, "A perverse man carrieth perdition in his mouth; and in his lips he hideth a fire." Also again, he warneth us, and says, "Hedge in thy ears with thorns, and hearken not to a wicked tongue." And again: "A wicked doer giveth heed to the tongue of the unjust; but a righteous man does not listen to lying lips." And although I know that our brotherhood there, assuredly fortified by your foresight, and besides sufficiently cautious by their own vigilance, cannot be taken nor deceived by the poisons of heretics, and that the teachings and precepts of God prevail with them only in proportion as the fear of God is in them; yet, even although needlessly, either my solicitude or my love persuaded me to write these things to you, that no commerce should be entered into with such; that no banquets nor conferences be entertained with the wicked; but that we should be as much separated from them, as they are deserters from the Church; because it is written, "If he shall neglect to hear the Church, let him be unto thee as a heathen man and a publican." And the blessed apostle not only warns, but also commands us to withdraw from such. "We command you," he says, "in the name of Jesus Christ our Lord, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us." There can be no fellowship between faith and I faithlessness. He who is not with Christ, who is an adversary of Christ, who is hostile to His unity and peace, cannot be associated with us. If they come with prayers and atonements, let them be heard; if they heap together curses and threats, let them be rejected. I bid you, dearest brother, ever heartily farewell. — Epistle LIV Cyprian : Yet let not the excessive and headlong faithlessness of many move or disturb us, but rather strengthen our faith in the truthfulness which has foretold the matter. As some have become such, because these things were predicted beforehand, so let other brethren beware of matters of a like kind, because these also were predicted beforehand, even as the Lord instructs us, and says, "But take ye heed: behold, I have told you all things." Avoid, I beseech you, brethren, men of this kind, and drive away from your side and from your ears, as if it were the contagion of death, their mischievous conversation; as it is written, "Hedge thine ears about with thorns, and refuse to hear a wicked tongue." And again, "Evil communications corrupt good manners." The Lord teaches and warns us to depart from such. He saith, "They are blind leaders of the blind; and if the blind lead the blind, they shall both fall into the ditch." Such a one is to be turned away from and avoided, whosoever he may be, that is separated from the Church. Such a one is perverted and sins, and is condemned of his own self. Does he think that he has Christ, who acts in opposition to Christ's priests, who separates himself from the company of His clergy and people? He bears arms against the Church, he contends against God's appointment. An enemy of the altar, a rebel against Christ's sacrifice, for the faith faithless, for religion profane, a disobedient servant, an impious son, a hostile brother, despising the bishops, and forsaking God's priests, he dares to set up another altar, to make another prayer with unauthorized words, to profane the truth of the Lord's offering by false sacrifices, and not to know that he who strives against the appointment of God, is punished on account of the daring of his temerity by divine visitation. — Treatise I. On the Unity of the Church Cyprian : That we are to live with the good, but to avoid the evil. In Solomon, in the Proverbs: "Bring not the impious man into the habitation of the righteous." Also in the same, in Ecclesiasticus: "Let righteous men be thy guests." And again: "The faithful friend is a medicine of life and of immortality." Also in the same place: "Be thou far from the man who has the power to slay, and thou shalt not suspect fear." Also in the same place, : "Blessed is he who findeth a true friend, and who speaketh righteousness to the listening ear." Also in the same place: "Hedge thine ears with thorns, and hear not a wicked tongue." Also in the seventeenth Psalm: "With the righteous Thou shalt be justified; and with the innocent man Thou shalt be innocent; and with the froward man Thou shalt be froward." Also in the first Epistle of Paul to the Corinthians: "Evil communications corrupt good dispositions." — Treatise XII. Three Books of Testimonies Against the Jews Desert Fathers : A brother questioned Poemen and said, 'How should a monk live in his cell?' He said, 'To stay in the cell is this: externally, to work with the hands, eat once a day, keep silence and meditate and, internally, to make progress by remembering your sins wherever you may be, and keeping the hours of prayer, and keeping a watch on the secret thoughts of the heart. If it is time to stop working with the hands, begin to pray and finish your work later in tranquillity. The aim of all this is to be with those who are good and to avoid the company of the wicked.' — The Desert Fathers, Sayings of the Early Christian Monks Fabian of Rome : And the apostle says, "Evil communications corrupt good manners." Jerome : You despise gold; someone else loves it. You spurn wealth; he eagerly pursues it. You love silence, weakness and privacy. He takes delight in talking and effrontery in the public square, and streets, and apothecary shops.… Do not remain under the same roof with him. Do not rely on your past continence. You cannot be holier than David or wiser than Solomon.… If in the course of your clerical duty you have to visit a widow or a virgin, never enter the house alone. Let your companions be persons who will not disgrace you.… You must not sit alone with a woman secretly and without witnesses. If she has anything confidential to disclose, she is sure to have some nurse or housekeeper, some virgin, some widow, some married woman. She cannot be so friendless as to have none except you to whom she can venture to confide her secrets. — Letter 52 John Chrysostom : "Be not deceived: evil company doth corrupt good manners." Then that he might not make his discourse too rough, he dwells not long upon his "reductio ad absurdum," but again turns his discourse to exhortation, saying, "Be not deceived: evil company doth corrupt good manners." And this he said, both to rebuke them as without understanding, (for here he by a charitable expression, calls "good" that which is easily deceived,) and also, as far as he could, to make some allowance to them for the past with a view to their return, and to remove from them and transfer to others the greater part of his charges, and so by this way also to allure them to repentance. Which he doth likewise in the Epistle to the Galatians, saying, "But he that troubleth you shall bear his judgment, whosoever he be." — Homily on 1 Corinthians 40 Origen of Alexandria : We see quiet and respectable men who, when they have become associated with turbulent and shameless people, have their good manners corrupted by evil conversations. They are turned into men of the same sort as those who are steeped in every kind of witness. This sometimes happens to men of mature age, who prove that they have lived more chastely in youth than when advanced years had granted them the opportunity of a freer life. — ON FIRST PRINCIPLES 3.1.5 Tertullian : Follow companies and conversations worthy of God, mindful of that short verse, sanctified by the apostle's quotation of it, "Ill interviews good morals do corrupt." Talkative, idle, winebibbing, curious tent-fellows, do the very greatest hurt to the purpose of widow-hood. — To His Wife Book I