Psalm 95:8

• §2659Article 1 · At the Wellsprings of PrayerRead at vatican.va

  “Harden not your hearts."” — Catechism footnote: Ps 95:7-8.

Cyril of Jerusalem

• Cyril of Jerusalem, Catechetical Lectures Lecture 14

  “Verily I say unto thee, This day shalt thou be with Me in Paradise; because to-day thou hast heard My voice, and hast not hardened thine heart.” — editor's note: Ps. xcv. 7, 8.

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Clement of Alexandria

• Clement of Alexandria, Exhortation to the Heathen Chapter 9

  “For the Scripture somewhere says, “To-day, if ye will hear His voice, harden not your hearts, as in the provocation, in the day of temptation in the wilderness, when your fathers proved Me by trial.”” — editor's note: Ps. xcv. 8, 9.

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Augustine of Hippo

• Augustine of Hippo, Expositions on the Psalms Psalm 95

  “Therefore, “To-day if ye will hear His voice, harden not your hearts” (ver. 8).” — the author cites it

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• Matthew 6:11

  Cited together in Catechism §2659.

• Matthew 6:34

  Cited together in Catechism §2659.