Another interpretation, for the conductor on the sheminith: The verse (Proverbs 23:13) "Do not withhold discipline from a child" means that when you strike him, do so with a rod that will not cause his death. Likewise, it is said (Psalms 39:11), "You rebuke with punishment for sin; like a moth, You consume what is dear to him." Rebellion is good, but anger is not. As it is said (Jeremiah 10:24), "Correct me, O Lord, but in due measure; not in Your anger, lest You bring me to nothing."
Anger and wrath are two harbingers of death. And Solomon said (Proverbs 16:14), "The fury of a king is as messengers of death." Similarly, Moses said (Deuteronomy 9:19), "For I was afraid of the anger and wrath." Therefore, it is said, "Rebuke me not in Your anger." Suffering is good, but I lack the strength to withstand it, neither in anger nor in wrath.