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Romans 11:21 (WEB)
for if God didn’t spare the natural branches, neither will he spare you.

Catechism · 1

§755Paragraph 1 · The Church in God's PlanRead at vatican.va
“Yet the true vine is Christ who gives life and fruitfulness to the branches, that is, to us, who through the Church remain in Christ, without whom we can do nothing.” — Catechism footnote: LG 6; Cf. 1 Cor 39; Rom 11:13-26; Mt 21:32-43 and parallels; Isa 51-7; Jn 15:1-5.

Irenaeus of Lyons, Against Heresies IV.4Book IV
“Further, also, concerning Jerusalem and the Lord, they venture to assert that, if it had been “the city of the great King,” it would not have been deserted.” — editor's note: [Jer. vii. 4. One of the most powerful arguments in all Scripture is contained in the first twelve verses of this chapter, and it rebukes an inveterate…
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Irenaeus of Lyons, Against Heresies IV.27Book IV
“And therefore it was that Paul said, “For if [God] spared not the natural branches, [take heed] lest He also spare not thee, who, when thou wert a wild olive tree, wert grafted into the fatness of the olive tree, and wert made a partaker of its fatness.”” — editor's note: Rom. xi. 17, 21.
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Cyprian of Carthage, Epistles Letter 6
“I hear that some are puffed up and are arrogant, although it is written, “Be not high-minded, but fear: for if God spared not the natural branches, take heed lest He also spare not thee.”” — editor's note: Rom. xi. 20, 21. [How significant this warning to Rome!]
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Cyprian of Carthage, Three Books of Testimonies Against the Jews III.6Book III
“Of this same thing to the Romans: “Be not high-minded, but fear; for if God spared not the natural branches, (take heed) lest He also spare not thee.”” — editor's note: Rom. xi. 20, 21.
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Augustine of Hippo, Expositions on the Psalms Psalm 89
“That it should be said to the sinners, “For if God spared not the natural branches, take heed lest He also spare not thee.”” — editor's note: Rom. xi. 21.
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Augustine of Hippo, On the Sermon on the Mount II.14Book II
“For whose mercy can be mentioned as being so great as His, who pardons all the sins of those who return, and makes the wild olive a partaker of the fatness of the olive? and whose severity as being so great as His, who spared not the natural branches, but broke them off because of unbelief?” — editor's note: Rom. xi. 17–24.
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Tertullian, On Modesty Chapter 8
“…to grieve, at the restoration of Israel, if it be true, (as it is), that the whole of our hope is intimately united with the remaining expectation of Israel.” — editor's note: Comp. Rom. xi. 11–36.
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