“"Because my heart was delighted" (ver. 21). He is saying with what things he is tempted: "because my heart was delighted," he saith, "my reins also were changed." When those temporal things delighted me, my reins were changed. It may also be understood thus: "because my heart was delighted" in God, "my reins also were…”
Augustine of Hippo, 5th c. — Exposition on Psalm 73
Original
21Thus my heart was grieved, and I was pricked in my reins.
Modern
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In context
19How are they brought into desolation, as in a moment! they are utterly consumed with terrors.
20As a dream when one awaketh; so, O Lord, when thou awakest, thou shalt despise their image.
— Psalms 73:21 —
22So foolish was I, and ignorant: I was as a beast before thee.
23Nevertheless I am continually with thee: thou hast holden me by my right hand.