18 distinct Greek words appear in this verse.

• Love
• Obedience and Disobedience
• Righteousness

3 passages from patristic writers, Reformers, and church catechisms citing this verse.

• 1John 2:9 — He that saith he is in the light, and hateth his brother, is in darkness even until now.
• 1John 2:29 — If ye know that he is righteous, ye know that every one that doeth righteousness is born of him.
• 1John 3:7 — Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
• 1John 3:8 — He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.
• 1John 3:14 — We know that we have passed from death unto life, because we love the brethren. He that loveth not his brother abideth in death.
• 1John 4:3 — And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it
• 1John 4:6 — We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.
• 1John 4:7 — Beloved, let us love one another: for love is of God; and every one that loveth is born of God, and knoweth God.
• 1John 4:8 — He that loveth not knoweth not God; for God is love.
• 1John 4:21 — And this commandment have we from him, That he who loveth God love his brother also.
• 1John 5:2 — By this we know that we love the children of God, when we love God, and keep his commandments.
• 1John 5:19 — And we know that we are of God, and the whole world lieth in wickedness.
• 3John 1:11 — Beloved, follow not that which is evil, but that which is good. He that doeth good is of God: but he that doeth evil hath not seen God.
• Acts 13:10 — And said, O full of all subtilty and all mischief, thou child of the devil, thou enemy of all righteousness, wilt thou not cease to pervert the right ways of the Lord?
• Acts 24:25 — And as he reasoned of righteousness, temperance, and judgment to come, Felix trembled, and answered, Go thy way for this time; when I have a convenient season, I will call for thee.
• Deut 14:1 — Ye are the children of the LORD your God: ye shall not cut yourselves, nor make any baldness between your eyes for the dead.
• Eph 2:2 — Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
• Eph 5:1 — Be ye therefore followers of God, as dear children;
• Ezek 14:20 — Though Noah, Daniel, and Job, were in it, as I live, saith the Lord GOD, they shall deliver neither son nor daughter; they shall but deliver their own souls by their righteousness.
• Ezek 16:3 — And say, Thus saith the Lord GOD unto Jerusalem; Thy birth and thy nativity is of the land of Canaan; thy father was an Amorite, and thy mother an Hittite.
• Gen 3:15 — And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.
• Gen 4:2 — And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground.
• Heb 13:1 — Let brotherly love continue.
• Isa 26:7 — The way of the just is uprightness: thou, most upright, dost weigh the path of the just.
• Isa 57:3 — But draw near hither, ye sons of the sorceress, the seed of the adulterer and the whore.
• John 8:44 — Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he
• John 8:47 — He that is of God heareth God’s words: ye therefore hear them not, because ye are not of God.
• John 8:47 — He that is of God heareth God’s words: ye therefore hear them not, because ye are not of God.
• John 13:35 — By this shall all men know that ye are my disciples, if ye have love one to another.
• Luke 6:35 — But love ye your enemies, and do good, and lend, hoping for nothing again; and your reward shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and to the ev
• Luke 6:35 — But love ye your enemies, and do good, and lend, hoping for nothing again; and your reward shall be great, and ye shall be the children of the Highest: for he is kind unto the unthankful and to the ev
• Luke 16:8 — And the lord commended the unjust steward, because he had done wisely: for the children of this world are in their generation wiser than the children of light.
• Matt 3:7 — But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?
• Matt 5:22 — But I say unto you, That whosoever is angry with his brother without a cause shall be in danger of the judgment: and whosoever shall say to his brother, Raca, shall be in danger of the council: but wh
• Matt 6:14 — For if ye forgive men their trespasses, your heavenly Father will also forgive you:
• Matt 12:34 — O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
• Matt 13:38 — The field is the world; the good seed are the children of the kingdom; but the tares are the children of the wicked one;
• Matt 25:41 — Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
• Prov 11:19 — As righteousness tendeth to life: so he that pursueth evil pursueth it to his own death.
• Ps 112:4 — Unto the upright there ariseth light in the darkness: he is gracious, and full of compassion, and righteous.