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1 John 5:18 (WEB)
We know that whoever is born of God doesn’t sin, but he who was born of God keeps himself, and the evil one doesn’t touch him.

Catechism · 1

§2852Article 3 · The Seven PetitionsRead at vatican.va
“We know that we are of God, and the whole world is in the power of the evil one."” — Catechism footnote: 1 Jn 5:18-19.

Jerome, Against Jovinianus Book 2
“And at the end of the Epistle, “Whosoever is begotten of God sinneth not; but his being begotten of God keepeth him, and the evil one toucheth him not.”” — editor's note: 1 John v. 18.
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Jerome, Against the Pelagians Book 1
“C. But what answer will you give to the famous declaration of John the Evangelist:“We know that whosoever is begotten of God sinneth not; but the begetting of God keepeth him, and the evil one toucheth him not.” — editor's note: 1 John v. 18, 19.
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John Cassian, Conferences XI–XVII XI.9Conference XI
“…is born of God;” and again: “We know that every one who is born of God sinneth not, but his birth of God preserves him, and the wicked one toucheth him not?”” — editor's note: 1 John iii. 9; v. 18.
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Tertullian, On Modesty Chapter 19
“But we know that every one who hath been born of God sinneth not”—to wit, the sin which is unto death.” — editor's note: Vers. 17, 18.
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Tertullian, On Repentance Chapter 5
“Chapter V.—Sin Never to Be Returned to After Repentance.” — editor's note: [The formidable doctrine of 1 John iii. 9; v. 18, etc. must excuse our author for his severe adherence to this principle of purifying the heart from habitual…
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