1 John 3:15

Ver. 15 . “Every one who hateth his brother is a murderer.” For in him through unbelief Christ dies. Rightly, therefore, he continues, “And ye know that no murderer and unbeliever hath eternal life abiding in him.” For the living Christ abides in the believing soul.

For this also He came down. For this He clothed Himself with man. For this He voluntarily subjected Himself to the experiences of men, that by bringing Himself to the measure of our weakness whom He loved, He might correspondingly bring us to the measure of His own strength. And about to be offered up and giving Himself a ransom, He left for us a new Covenant-testament: My love I give unto you. And what and how great is it? For each of us He gave His life, the equivalent for all. This He demands from us in return for one another. …

But let the universal names of crimes withdraw to the specialities of their own works; let idolatry remain in that which it is itself. Sufficient to itself is a name so inimical to God, a substance of crime so copious, which reaches forth so many branches, diffuses so many veins, that from this name , for the greatest part, is drawn the material of all the modes in which the expansiveness of idolatry has to be foreguarded against by us, since in manifold wise it subverts the servants of God; and this not only when unperceived, but also when cloaked over. …

24. For even in the sacrifices which Abel and Cain first offered, God looked not at their gifts, but at their hearts, so that he was acceptable in his gift who was acceptable in his heart. Abel, peaceable and righteous in sacrificing in innocence to God, taught others also, when they bring their gift to the altar, thus to come with the fear of God, with a simple heart, with the law of righteousness, with the peace of concord. With reason did he, who was such in respect of God’s sacrifice, become subsequently himself a sacrifice to God; so that he who first set forth martyrdom, and initiated the Lord’s passion by the glory of his blood, had both the Lord’s righteousness and His peace. …

11. Why do you rush into the darkness of jealousy? why do you enfold yourself in the cloud of malice? why do you quench all the light of peace and charity in the blindness of envy? why do you return to the devil, whom you had renounced? why do you stand like Cain? For that he who is jealous of his brother, and has him in hatred, is bound by the guilt of homicide, the Apostle John declares in his epistle, saying, “Whosoever hateth his brother is a murderer; and ye know that no murderer hath life abiding in him.” And again: “He that saith he is in the light, and hateth his brother, is in darkness even until now, and walketh in darkness, and knoweth not whither he goeth, because that darkness hath blinded his eyes.” Whosoever hates, says he, his brother, walketh in darkness, and knoweth not whither he goeth. …

In Malachi: “Hath not one God created us? Is there not one Father of us all? Why have ye certainly deserted every one his brother?” Of this same thing according to John: “Peace I leave with you, my peace I give unto you.” Also in the same place: “This is my commandment, That ye love one another, even as I have loved you. Greater love than this has no man, than that one should lay down his life for his friends.” Also in the same place: “Blessed are the peacemakers, for they shall be called the sons of God.” Also in the same place: “Verily I say unto you, That if two of you shall agree on earth concerning everything, whatever you shall ask it shall be given you from my Father which is in heaven. …

14. Quarrels should be unknown among you, or at least, if they arise, they should as quickly as possible be ended, lest anger grow into hatred, and convert “a mote into a beam,” and make the soul chargeable with murder. For the saying of Scripture: “He that hateth his brother is a murderer,” does not concern men only, but women also are bound by this law through its being enjoined on the other sex, which was prior in the order of creation. Let her, whoever she be, that shall have injured another by taunt or abusive language, or false accusation, remember to remedy the wrong by apology as promptly as possible, and let her who was injured grant forgiveness without further disputation. If the injury has been mutual, the duty of both parties will be mutual forgiveness, because of your prayers, which, as they are more frequent, ought to be all the more sacred in your esteem. …

23. Thus, as regards murder, which was understood to mean merely the destruction of the body, by which a man is deprived of life, the Lord explained that every unjust disposition to injure our brother is a kind of murder. So John also says, "He that hateth his brother is a murderer." And as it was thought that adultery meant only the act of unlawful intercourse with a woman, the Master showed that the lust He describes is also adultery. Again, because perjury is a heinous sin, while there is no sin either in not swearing at all or in swearing truly, the Lord wished to secure us from departing from the truth by not swearing at all, rather than that we should be in danger of perjury by being in the habit of swearing truly. For one who never swears is less in danger of swearing falsely than one who is in the habit of swearing truly. …

27. He makes an assumption, then, not "of mere custom," but "of the reason of truth itself," when he says that the sacrament of God cannot be turned to error by the error of any men, since it is declared to exist even in those who have erred. Assuredly the Apostle John says most plainly, "He that hateth his brother is in darkness even until now;" and again, "Whosoever hateth his brother is a murderer;" and why, therefore, do they baptize those within the Church whom Cyprian himself declares to be in the envy of malice?

12. To this I answer, that all who even within the Church profess that they know God, but deny Him in their deeds, such as are the covetous and envious, and those who, because they hate their brethren, are pronounced to be murderers, not on my testimony, but on that of the holy Apostle John, all these are both devoid of hope, because they have a bad conscience; and are faithless, because they do not do what they have vowed to God; and liars, because they make false professions; and possessed of devils, because they give place in their heart to the devil and his angels; and their words work corruption, since they corrupt good manners by evil communications; and they are infidels, because they laugh at the threats which God utters against such men; and accursed, because they live wickedly; and antichrists, because their lives are opposed to Christ; and cursed of God, since holy Scripture e …

41. To this we may answer almost word for word: Murderers may either do nothing or everything. If they can baptize, they can also give the Holy Spirit; but if they cannot give the Holy Spirit, because they do not possess the Holy Spirit, then can they not either spiritually baptize. Therefore we give our judgment that persons baptized by murderers, or murderers themselves who have been baptized without being converted, should, when they have corrected themselves, be baptized. Yet this is not true. For "whosoever hateth his brother is a murderer;" and Cyprian knew such men within the Church, who certainly baptized. Therefore it is to no purpose that words of this sort are used concerning heretics.

46. And when we ask of you which of your party you can prove to have been slain by us, I indeed can remember no law issued by the emperors to the effect that you should be put to death. Those indeed whose deaths you quote most frequently to bring us into odium, Marculus and Donatus, present a great question, whether they threw themselves down a precipice, as your teaching does not hesitate to encourage by examples of daily occurrence, or whether they were thrown down by the true command of some authority. …