1 John 3:19
In this we know that we are of the truth: and in his sight shall persuade our hearts.
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- Vulgate (Clementine)
- in hoc cognoscimus quoniam ex veritate sumus : et in conspectu ejus suadebimus corda nostra.
- Greek New Testament (SBLGNT)
- ἐν τούτῳ γνωσόμεθα ὅτι ἐκ τῆς ἀληθείας ἐσμέν, καὶ ἔμπροσθεν αὐτοῦ πείσομεν τὴν καρδίαν ἡμῶν
Haydock's commentary
On verses 19 to 20
And in his sight we shall persuade our hearts. That is, if we love God and our neighbour in deed, as he said before, we may rest satisfied in conscience that we follow the ways of truth, and may have a well-grounded confidence in God.
But if our hearts reprehend us, for not complying with this duty and precept of charity, God is still greater than our heart; i.e. he sees and knows the interior dispositions of our heart, even better than we know ourselves, and therefore we have more reason to fear him, especially when even our heart and conscience reprehend us. (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 Stromata, or Miscellanies, Chapter XVI. Passages of Scripture Respecting the Constancy, Patience, and Love of the Martyrs
“With the heart man believeth unto righteousness, and with the mouth confession is made unto salvation. Wherefore the Scripture saith, Whosoever believeth on Him shall not be ashamed; that is, the word of faith which we preach: for if thou confess the word with thy mouth that Jesus is Lord, and believe in thy heart that God hath raised Him from the dead, thou shalt be saved.” There is clearly described the perfect righteousness, fulfilled both in practice and contemplation. Wherefore we are “to bless those who persecute us. …
St Augustine Ten Homilies on the First Epistle of John, 1 John III. 19, IV. 3
1. If ye remember, brethren, yesterday we closed our sermon at this sentence, which without doubt behooved and does behoove to abide in your heart, seeing it was the last ye heard. “My little children, let us not love only in word and in tongue; but in deed and in truth.” Then he goes on: “And herein we know that we are of the truth, and assure our hearts before Him.” “For if our heart think ill of us, God is greater than our heart, and knoweth all things.” He had said, “Let us not love only in word and in tongue, but in work and in truth:” we are asked, In what work, or in what truth, is he known that loveth God, or loveth his brother? Above he had said up to what point charity is perfected: what the Lord saith in the Gospel, “Greater love than this hath no man, that one lay down his life for his friends,” this same had the apostle also said: “As He laid down His life for us, we ought a …
St Augustine Ten Homilies on the First Epistle of John, 1 John III. 19, IV. 3
3. This it is then that he enforces here. “In this we know that we are of the truth, when in deed and in truth” we love, “not only in words and in tongue: and assure our heart before Him.” What meaneth, “before Him?” Where He seeth. Whence the Lord Himself in the Gospel saith: “Take heed that ye do not your righteousness before men, to be seen of them: otherwise ye have no reward with your Father which is in heaven.” And what meaneth, “Let not thy left hand know what thy right hand doeth:” except that the right hand means a pure conscience, the left hand the lust of the world? Many through lust of the world do many wonderful things: the left hand worketh, not the right. The right hand ought to work, and without knowledge of the left hand, so that lust of the world may not even mix itself therewith when by love we work aught that is good. …