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1 John 3:24 (WEB)
He who keeps his commandments remains in him, and he in him. By this we know that he remains in us, by the Spirit which he gave us.

Catechism · 1

§2845Article 3 · The Seven PetitionsRead at vatican.va
“It is lived out in prayer, above all in the Eucharist.” — Catechism footnote: Cf. Mt 5:23-24; 1 Jn 3:19-24.

Athanasius of Alexandria, Against the Arians I.10Discourse I
“For because of our relationship to His Body we too have become God’s temple, and in consequence are made God’s sons, so that even in us the Lord is now worshipped, and beholders report, as the Apostle says, that God is in them of a truth.” — editor's note: ὄντως ἐν ὑμῖν ὁ θεός. 1 Cor. xiv. 25. Athan. interprets ἐν in not among; as also in 1 John iii. 24, just afterwards. Vid. ἐν ἐμοί. Gal. i. 24. ἐντὸς ὑμῶν, Luke…
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Augustine of Hippo, Homilies on the First Epistle of John Homily 6
““And he that keepeth His commandment”—ye see that none other thing is bidden us than that we love one another—“And he that keepeth His commandment shall abide in Him, and He in him.”” — editor's note: 1 John iii. 24.
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Augustine of Hippo, Sermons on New Testament Lessons Sermon 21
“And, “Hereby we know” as the Apostle John says, “that Christ dwelleth in us, by His Spirit which He hath given us.”” — editor's note: 1 John iii. 24.
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Basil the Great, On the Holy Spirit Chapter 4
“John too writes, “Hereby we know that he abideth in us by (ἐκ) the spirit which he hath given us.”” — editor's note: 1 John iii. 24.
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Ambrose of Milan, On the Holy Spirit I.8Book I
“John says of God: “Hereby know we that He abides in us by the Spirit which He hath given us.”” — editor's note: 1 John iii. 24.
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