Catena Fidei

Joel 2:12 (WEB)
“Yet even now,” says the LORD, “turn to me with all your heart, and with fasting, and with weeping, and with mourning.”

Catechism · 1

§1430Article 4 · The Sacrament of Penance and ReconciliationRead at vatican.va
“Without this, such penances remain sterile and false; however, interior conversion urges expression in visible signs, gestures and works of penance.” — Catechism footnote: Cf. Joel 2:12-13; Isa 1:16-17; Mt 6:1-6; 16-18.

Cyprian of Carthage, Epistles Letter 51
“…garments, and return unto the Lord your God; for He is gracious and merciful, slow to anger, and of great kindness, and repenteth Him of the evil appointed.”” — editor's note: Joel ii. 12, 13.
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Cyprian of Carthage, On the Lapsed
““Turn ye,” He says, “to me with all your heart, and at the same time with fasting, and with weeping, and with mourning; and rend your hearts, and not your garments.”” — editor's note: Joel ii. 12.
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Jerome, Letters Letter 122
“Joel also writes: “turn ye even to me with all your heart, and with fasting and with weeping and with mourning: and rend your heart and not your garments and turn unto the Lord your God; for he is gracious and merciful…and repenteth him of the evil.”” — editor's note: Joel ii. 12, 13.
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Leo the Great, Sermons Sermon 88
“…and rend your hearts and not your garments, and turn ye to the Lord your God, for He is merciful and patient, and of great kindness, and very merciful,” and again, “sanctify a fast, proclaim a healing, assemble the people, sanctify the church.”” — editor's note: Joel ii. 12, 13, and 15, 16.
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