Augustine of Hippo

But what addeth he? "The Lord will delight in them that fear Him, and in them that hope in His mercy." A robber is feared, and a wild beast is feared, and an unjust and powerful man is much feared. "The Lord will delight in them that hope in His mercy." Behold, Judas, who betrayed our Lord, feared, but he did not hope in His mercy. ...It is well indeed that thou hast feared, but only if thou trustedst in His mercy, whom thou hast feared. …

Exposition on Psalm 147 ↗

Jerome

The Lord is well pleased with those who fear him. One fear casts out many fears. Is it not better to fear one, that you may not fear many, than to fear many, that you may not fear one? And with those who hope in his mercy. They hope not in their own works, but in the mercy of the judge. Praise the Lord, for a psalm is good; for in those who hope in his mercy is salvation alone. To whom is glory forever and ever. Amen.

Homily 56, on Psalm 146 ↗

Bonaventure

However powerful, rich, learned, and strong a man may be, unless he fears God, nothing avails him. Whence the Psalm: "He shall not take pleasure in the strength of the horse, nor shall he be well pleased with the legs of a man: the Lord is well pleased with those who fear him, and with those who hope in his mercy."

Collationes de Septem Donis, Collation 2 ↗