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Galatians 1:15 (WEB)
But when it was the good pleasure of God, who separated me from my mother’s womb and called me through his grace,

Catechism · 2

§153Article 1 · I BelieveRead at vatican.va
“When St. Peter confessed that Jesus is the Christ, the Son of the living God, Jesus declared to him that this revelation did not come "from flesh and blood", but from "my Father who is in heaven".” — Catechism footnote: Mt 16:17; cf. Gal 1:15; Mt 11:25.

§442Article 2 · "And in Jesus Christ, His Only Son, Our Lord"Read at vatican.va
“Similarly Paul will write, regarding his conversion on the road to Damascus, "When he who had set me apart before I was born, and had called me through his grace, was pleased to reveal his Son to me, in order that I might preach him among the Gentiles..."” — Catechism footnote: Gal 1:15-16.

Irenaeus of Lyons, Against Heresies V.12Book V
“…when it pleased God, who separated me from my mother’s womb, and called me by His grace, to reveal His Son in me, that I might preach Him among the Gentiles,” it was not, as I have already observed, one person who had been born from the womb, and another who preached the Gospel of the Son of God; but that same…” — editor's note: Gal. i. 15, 16.
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Irenaeus of Lyons, Against Heresies V.15Book V
“And Paul, too, says in like manner, “But when it pleased God, who separated me from my mother’s womb, that I might declare Him among the nations.”” — editor's note: Gal. i. 15.
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Theodoret of Cyrus, Dialogues (Eranistes) §3
“Orth.—Hear now the holy Paul when he says “But when it pleased God who separated me from my mother’s womb, and called me by his grace, to reveal his son in me that I might preach him among the heathen, immediately I conferred not with flesh and blood neither went I up to them that were apostles before me.”” — editor's note: Gal. i. 15–17
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Theodoret of Cyrus, Letters Letter 147
“And in his Epistle to the Galatians he writes, “But when it pleased God who separated me from my mother’s womb and called me by His grace to reveal His Son in me that I might preach Him among the heathen.”” — editor's note: Gal. i. 15, 16
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John Chrysostom, Homilies on Matthew Homily 61
“This Paul also declared when he said, “When it pleased Him, who separated me from my mother’s womb.”” — editor's note: Gal. i. 15.
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Jerome, Letters Letter 22
“If, then, the apostle, who was a chosen vessel separated unto the gospel of Christ, by reason of the pricks of the flesh and the allurements of vice keeps under his body and brings it into subjection, lest when he has preached to others he may…” — editor's note: Gal. i. 15.
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Tertullian, On the Resurrection of the Flesh Chapter 50
“…it pleased God to reveal to him His Son, to preach Him amongst the heathen, immediately conferred not with flesh and blood,” as he writes to the Galatians, (meaning by the phrase) the circumcision, that is to say, Judaism.” — editor's note: See i. 15, 16.
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Tertullian, The Five Books Against Marcion V.1Book V
“…consulted, determined, by the authority of the Holy Ghost, that “a yoke should not be put upon men’s necks which their fathers even had not been able to bear.”” — editor's note: See Gal. i. 11–24, compared with Acts xv. 5–29.
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