Augustine of Hippo

And what hath He accomplished for thee? What hath He done for thee? "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). He hath given us great blessings already: and still He is our debtor; but let him who hath this part of the debt repaid already, believe that the rest will be also, seeing that he ought to have believed even before he received anything. …

Exposition on Psalm 40 ↗

Ambrose of Milan

Christ has heard the prayer of his own servants and has brought us out from the pit of misery and from the mire of dregs. We were drowning there; our whole flesh was clinging to the mire, trapped in the whirlpool of our sins. Our soul was powerless to save itself; fallen and ruined as it was by the multiplicity and dreadfulness of our offenses. Thanks be to the Lord Jesus, God's only Son, who came down from heaven to forgive us our sins. …

Commentaries on the Twelve Davidic Psalms ↗

Thomas Aquinas

Here he presents in particular the efficacy of confidence in the things in which he was heard. And he touches upon three things. First, deliverance from evils. Second, the bestowal of goods, at "And he set." Third, thanksgiving for both, at "And he put." Now there is a twofold evil from which men flee: namely the evil of misery and of punishment. As to the first he says, "He brought me out of the pit of misery." And this can also refer to the temporal misery in which David once found himself. …

Exposition on the Psalms of David ↗