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Psalm 40:2 (WEB)
He brought me up also out of a horrible pit, out of the miry clay. He set my feet on a rock, and gave me a firm place to stand.

Catechism · 1

§2657Article 1 · At the Wellsprings of PrayerRead at vatican.va
“Conversely, the prayer of the Church and personal prayer nourish hope in us. the psalms especially, with their concrete and varied language, teach us to fix our hope in God: "I waited patiently for the LORD; he inclined to me and heard my cry."” — Catechism footnote: Ps 40:2.

John Cassian, Conferences XI–XVII XIII.12Conference XIII
“He waits for us, when it is said by the prophet: “Wherefore the Lord waiteth to have compassion upon us;” and He is waited for by us, when we say: “I waited patiently for the Lord, and He inclined unto me;” and: “I have waited for thy salvation, O Lord.”” — editor's note: Ps. xxxix. (xl.) 2; cxviii. (cxix.) 166.
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Augustine of Hippo, Expositions on the Psalms Psalm 40
““He brought me up also out of a horrible pit, out of the miry clay, and set my feet upon a rock, and established my goings” (ver. 2).” — the author cites it
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Augustine of Hippo, The City of God XVIII.32Book XVIII
“The Lord God is my strength, and He will set my feet in completion; He will place me above the heights, that I may conquer in His song,” to wit, in that song of which something similar is said in the psalm, “He set my feet upon a rock, and directed my goings, and put in my mouth a new song, a hymn to our God.”” — editor's note: Ps. xl. 2, 3.
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Augustine of Hippo, The City of God XVIII.35Book XVIII
“For it is said of it in the Psalms, “And He led me forth out of the lake of misery, and from the miry clay.”” — editor's note: Ps. xl. 2.
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Jerome, Letters Letter 122
“For her part she heard the Lord saying to her as to Moses: “as for thee stand thou here by me;” and with the psalmist she said of Him: “He hath set my feet upon a rock.”” — editor's note: Ps. xl. 2.
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Jerome, Letters Letter 130
“When he tries to dislodge us from our position and to make us fall back, we must plant our feet firmly down, and say with the psalmist, “he hath set my feet upon a rock” and “the rocks are a refuge for the conies.”” — editor's note: Ps. xl. 2.
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Theodoret of Cyrus, Letters Letter 77
“…“draw them out of the horrible pit, out of the miry clay, and set their feet upon a rock,” and “put a new song into their mouth, even praise unto our God,” that their example of life may become an example of salvation, that “many shall see it and fear and shall trust in the Lord.”” — editor's note: Psalm xl. 2 and 3
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Gregory of Nazianzus, Orations Oration 2
“…the tide which tosses and whirls us hither and thither, by the aid of our senses and other sources of the pleasures of this life; and against the miry clay in which we have been fixed; and against the law of sin, which wars against the law of the spirit, and strives to destroy the royal image in us, and all the…” — editor's note: Ps. xl. 2; lxix. 2.
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