When the wicked, even my enemies and my foes, came upon me to eat up my flesh, they stumbled and fell.
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Augustine of Hippo
AD 430
2. "Whilst the guilty approach unto me to eat up my flesh" (ver. 2). Whilst the guilty come near to recognise and insult me, that they may exalt themselves above me in my change for the better; that with their reviling tooth they may consume not me, but rather my fleshly desires. "Mine enemies who trouble me." Not they only who trouble me, blaming me with a friendly intent, and wishing to recall me from my purpose, but mine enemies also. "They became weak, and fell." Whilst then they do this with the desire of defending their own opinion, they became weak to believe better things, and began to hate the word of salvation, whereby I do what displeases them.
Flesh. This expression marks the fury of his enemies. See Job xix. 22., and xxxi. 31. (Calmet)
That. Hebrew and Septuagint, "and my foes. "This may denote domestic, and the former word public, enemies. (Haydock)
Weakened. Hebrew also, "have stumbled. "Those who came to take Jesus Christ, verified this prediction, John xviii. 6. (Calmet)