1 John 2:4
He who saith that he knoweth him, and keepeth not his commandments, is a liar, and the truth is not in him.
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- Vulgate (Clementine)
- Qui dicit se nosse eum, et mandata ejus non custodit, mendax est, et in hoc veritas non est.
- Greek New Testament (SBLGNT)
- ὁ λέγων ὅτι Ἔγνωκα αὐτὸν καὶ τὰς ἐντολὰς αὐτοῦ μὴ τηρῶν ψεύστης ἐστίν, καὶ ἐν τούτῳ ἡ ἀλήθεια οὐκ ἔστιν·
Haydock's commentary
He that says he knoweth him, &c. To know, in this and many other places, is not taken for a speculative knowledge alone, but is joined with a love of God, and an earnest desire of serving him and keeping his commandments. (Witham)
From Haydock's Catholic Bible Commentary, 1859, in the transcription made by Todd Easton and kept online by John Paul Wohlschied at johnblood.gitlab.io/haydock.
The Fathers on this verse
Clement of Alexandria The Instructor, Chapter XII. Continuation: with Texts from Scripture
And now, in truth, it is time for me to cease from my instruction, and for you to listen to the Teacher. And He, receiving you who have been trained up in excellent discipline, will teach you the oracles. To noble purpose has the Church sung, and the Bridegroom also, the only Teacher, the good Counsel, of the good Father, the true Wisdom, the Sanctuary of knowledge. “And He is the propitiation for our sins,” as John says; Jesus, who heals both our body and soul, which are the proper man. “And not for our sins only, but also for the whole world. And by this we know that we know Him, if we keep His commandments. He that saith, I know Him, and keepeth not His commandments, is a liar; and the truth is not in Him. But whoso keepeth His word, in him verily is the love of God perfected. Hereby know we that we are in Him. …
Clement of Alexandria The Stromata, or Miscellanies, Book III
ut qui malum a se accersitum, nunc et in posterum eligant. Si ergo “omnia licerent,” nec timendum esset ne a spe excideremus propter malas actiones, esset fortasse eis aliquis præ textus, cur male viverent et miserabiliter. Quoniam autem vita beata nobis ostensa est per præcepta, quam oportet omnes sequentes, nec aliquid eorum, quæ dicta sunt, perperam intelligentes, nec eorum, quæ convenit, aliquid, etsi sit vel minimum, contemnentes, sequi quo Iogos ducit; quiâ, si ab eo aberraverimus, in malum immortale incidamus necesse est; si divinam autem Scripturam secuti fuerimus, per quam ingrediuntur, qui crediderunt, ut Domino, quoad fieri potest, assimilentur, non est vivendum indifferenter, sed pro viribus mundos esse oportet a voluptatibus et cupiditatibus, curaque est gerenda animæ, qua apud solum Deum perseverandum est. …
St Cyprian The Epistles of Cyprian, Epistle XXIV
2. To these glorious beginnings of confession and the omens of a victorious warfare, has been added the maintenance of discipline, which I observed from the vigour of your letter that you lately sent to your colleagues joined with you to the Lord in confession, with anxious admonition, that the sacred precepts of the Gospel and the commandments of life once delivered to us should be kept with firm and rigid observance. Behold another lofty degree of your glory; behold, with confession, a double title to deserving well of God, to stand with a firm step, and to drive away in this struggle, by the strength of your faith, those who endeavour to make a breach in the Gospel, and bring impious hands to the work of undermining the Lord’s precepts: to have before afforded the indications of courage, and now to afford lessons of life. …
St Augustine Book III, Chapter VI
10. Therefore I fell among men proudly raving, very carnal, and voluble, in whose mouths were the snares of the devil, the birdlime being composed of a mixture of the syllables of Thy name, and of our Lord Jesus Christ, and of the Paraclete, the Holy Ghost, the Comforter. These names departed not out of their mouths, but so far forth as the sound only and the clatter of the tongue, for the heart was empty of truth. Still they cried, “Truth, Truth,” and spoke much about it to me, “yet was it not in them;” but they spake falsely not of Thee only, who, verily, art the Truth, but also of these elements of this world, Thy creatures. And I, in truth, should have passed by philosophers, even when speaking truth concerning them, for love of Thee, my Father, supremely good, beauty of all things beautiful. …
St Augustine Ten Homilies on the First Epistle of John, 1 John I. 1, II. 11
9. “And in this,” saith he, “we do know Him, if we keep His commandments.” What commandments? “He that saith, I know Him, and keepeth not His commandments, is a liar, and the truth is not in him.” But still thou askest, What commandments? “But whoso,” saith he, “keepeth His word, in him verily is the love of God perfected.” Let us see whether this same commandment be not called love. For we were asking, what commandments, and he saith, “But whoso keepeth His word, in him verily is the love of God perfected.” Mark the Gospel, whether this be not the commandment: “A new commandment,” saith the Lord, “give I unto you, that ye love one another. In this we know that we are in Him, if in Him we be perfected.” Perfected in love, he calls them: what is perfection of love? To love even enemies, and love them for this end, that they may be brethren. For not a carnal love ought ours to be. …
St Jerome Against Jovinianus, Book II
2. This would be a real difficulty and one for ever incapable of solution were it not solved by the witness of John himself, who immediately goes on to say,“My little children, guard yourselves from idols.” If everyone that is born of God sinneth not, and cannot be tempted by the devil, how is it that he bids them beware of temptation? Again in the same Epistle we read:“If we say that we have no sins, we deceive ourselves, and the truth is not in us. If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. If we say that we have not sinned, we make him a liar, and his word is not in us.” I suppose that John was baptized and was writing to the baptized: I imagine too that all sin is of the devil. Now John confesses himself a sinner, and hopes for forgiveness of sins after baptism. …
St Gregory the Great Register of the Epistles of St. Gregory the Great, To George, Presbyter
Moreover, after your departure I learnt from information given me by my most beloved sons the deacons that your Love had said that our Almighty Lord and Saviour Jesus Christ, when He descended into hell, saved all who there acknowledged Him as God , and delivered them from the pains due to them. With regard to this subject I desire that your Charity should think very differently. For, when He descended into hell, He delivered through His grace those only who both believed that He should come and observed His precepts in their lives. For it is evident that after the incarnation of the Lord no one can be saved, even of those who hold His faith, who have not the life of faith; since it is written, They acknowledge that they know God , but in deeds they deny Him ( Tit. i. 16 ). And John says, He that saith that he knows Him, and keepeth not His commandments, is a liar ( 1 John ii. 4 ). …