Augustine of Hippo

Diapsalma. The answer of God: "I will give you understanding, and will set you in the way in which you shall go;" I will give you understanding after confession, that you depart not from the way in which you should go; lest you wish to be in your own power. "I will fix Mine Eyes upon you" [Psalm 32:8]; so will make sure upon you My Love.

Exposition on Psalm 32 ↗

Thomas Aquinas

Second, when he says "I will give you understanding," he shows the effect of his prayer. It is God who speaks: "I will give you understanding," etc. As if God were saying: you ask me to rescue you, and I will do three things for you: I will give you the gift of understanding, I will instruct you, and I will guard you. For three things are necessary for a person from God. First, that he may receive the gift of grace, so that through it the person's soul may be perfected for acting promptly. …

Exposition on the Psalms of David ↗

Bonaventure

"I will give you understanding and I will instruct you in this way in which you shall walk; I will fix my eyes upon you." The Lord promises us this understanding and shows us how we ought to receive it. "I will fix my eyes upon you": the divine good pleasure accepts what we do, approving in the present and rewarding in the future. …

Collationes de Septem Donis, Collation 8 ↗