The “rod of discipline” isn’t a comfortable shepherding analogy in Prov 22:15 [see #1 in “A time to coax…” pt. 2]. That the rod is meant to be painful is confirmed by the stated objective (i.e. to drive away folly) and by the other uses of “rod” in Proverbs most notably in verses like 10:13, 23:13, and 26:3. Two broader observations should be mentioned:
(2) The broad context of Proverbs asserts that physical discipline is a necessity. Christian parents will find greater motivation for loving, faithful discipline when they consider the alternative(s) detailed in Proverbs. Folly that freely festers in a child’s heart will corrupt him into a fool. The failure to draw the Proverbial connections between folly and fools obscures the indispensable role of parental discipline. We wield the “rod of discipline” because abdicating this God-given charge is a catalyst for moral & spiritual disaster. Even a casual examination of what Proverbs has to say about the condition and fate of a fool Proverbs depicts the battle with folly as a matter of life and death.
5:23 He dies for lack of discipline, and because of his great folly he is led astray.
19:3 When a man’s folly brings his way to ruin, his heart rages against the LORD.
26:11 Like a dog that returns to his vomit is a fool who repeats his folly.
Ironically, some corners of Christian culture will recoil at the sight of vomit-slurping, godless rebels destined for death even as they proclaim their aversion to spanking.
(3) The broader context of the OT only affirms the place of corporal punishment in child rearing. When the remedy for the evil of a rebellious son is public stoning (Deut 21:18-21), a spanking seems like a bargain! Small wonder that the OT people didn’t balk at the notion of corporal punishment during the child rearing years. But the bigger issue is whether or not we’re able to discern and emulate the Father’s heart in discipline. On this point I would turn to several OT passages where God employs corporal punishment on His children (Deut 8:5; 2Sam 7:14; Isa 10:5; Jer 2:3) and follow those passages by the acknowledgment that divine discipline is still a model for parental discipline in the NT era (Heb 12:4ff; Rev 3:19).
Make no mistake, godly discipline is as unpleasant as it is necessary. But until He comes we affirm the goodness of painful discipline even though we flinch (Heb 12:11-13).