Augustine of Hippo

But what to you? "But my feet were almost moved" [Psalm 73:2]. When were the feet moved, except when the heart was not right? Whence was the heart not right? Hear: "My steps were well near overthrown." What he has meant by "almost," the same he has meant by "well near:" and what he has meant by "my feet were almost moved," the same he has meant by "my steps were overthrown." Almost my feet were moved, almost my steps were overthrown. Moved were the feet: but whence were the feet moved and the steps overthrown? …

Exposition on Psalm 73 ↗

Ambrose of Milan

Indeed, in what follows, David describes his own experience when he says, "But my feet were almost moved, my steps had well nigh slipped, for I was envious in the case of sinners, when I saw the peace of sinners." He is surely not speaking of bodily feet and bodily steps but of the uprightness of the heart and of the step concerning which he says in another passage, "Let not the foot of pride come to me and let not the hand of sinners move me." And so, we ought always to ask that the Lord may direct the footsteps of our spirits. …

Interrogation of Job and David, Book 3, Chapter III ↗