And in my prosperity I said, I shall never be moved.
Read Chapter 30
Augustine of Hippo
AD 430
7. "But I said in my abundance, I shall not be moved for ever" (ver. 6). But I, that people which was speaking from the first, said in mine abundance, suffering now no more any want, "I shall not be moved for ever."
Moved. David thought himself invincible; and, out of vanity, ordered his subjects to be numbered. God showed his displeasure only for three days, and all was in confusion, ver. 8. (Calmet)
Though we may imagine that we are firmly established, we must acknowledge that all our strength is derived from God, who sometimes leaves us to experience our own weakness. (Worthington)