Catena Fidei

Psalm 31:21 (WEB)
Praise be to the LORD, for he has shown me his marvelous loving kindness in a strong city.

Fathers and councils · 4

Gregory of Nyssa, Against Eunomius X.1Book X
“…grants the boon of immortality, and the Way when He guides us from error to the truth; so also He is termed a “tower of strength,” and a “city of encompassing,” and a fountain, and a rock, and a vine, and a physician, and resurrection, and all the like, with reference to us, imparting Himself under various aspects by…” — editor's note: Ps. xxxi. 21 (LXX.).
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Augustine of Hippo, Expositions on the Psalms Psalm 31
““Blessed be the Lord; for He hath made His mercy marvellous, in the city of compassing” (ver. 21).” — the author cites it
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Augustine of Hippo, Expositions on the Psalms Psalm 59
“That world, which in certain places the Scripture calleth “the city of standing round:” that is, because in all nations everywhere the world had encompassed the one nation of Jews, where such words were being spoken, and it was called “the city of standing round.”” — editor's note: E.V. “strong city.” Ps. xxxi. 21, lx. 9, cviii. 10.
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Augustine of Hippo, On the Holy Trinity I.13Book I
“…righteous man shall not be afraid” if only he be kept in “the tabernacle,” that is, in the true faith of the Catholic Church, from “the strife of tongues,” that is, from the sophistries of heretics.” — editor's note: Ps. xxxi. 21
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