1 John 4:9

• §458Paragraph 1 · The Son of God Became ManRead at vatican.va

  “The Word became flesh so that thus we might know God's love: "In this the love of God was made manifest among us, that God sent his only Son into the world, so that we might live through him."” — Catechism footnote: I Jn 4:9.

Athanasius of Alexandria

• Athanasius of Alexandria, Against the Arians II.6Discourse II

  “Thus, ‘We have seen His glory, the glory as of the Only-begotten of the Father;’ and ‘God sent His Only-begotten Son;’ and ‘O Lord, Thy Word endureth for ever;’ and ‘In the beginning was the Word, and the Word was with God;’ and ‘Christ the Power of God and the Wisdom of…” — editor's note: 1 John iv. 9.

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Augustine of Hippo

• Augustine of Hippo, Homilies on the First Epistle of John Homily 7

  ““In this was manifested the love of God in us.”” — editor's note: 1 John iv. 9.

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• Augustine of Hippo, On the Holy Trinity XV.17Book XV

  “For man has not whence to love God, unless from God; and therefore he says a little after, “Let us love Him, because He first loved us.”” — editor's note: 1 John iv. 7–19

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• John 3:16

  Cited together in Catechism §458.