We must honor that right. But perhaps the ultimate reason that God has appointed the rod has to do with the connection that He has created between pain and conscience. Physical pain enforces and reinforces the pronouncement of conscience that certain behavior is wrong and must be avoided. Thus, the good effects of conscience are enhanced. We learn quickly to avoid what is painful.
Nothing is so painful as sin.
Parents who withhold that momentary pain are setting up their children and themselves for much worse and more devastating pain later. Next, counsel for the obedience of Scripture on this crucial subject.