Raising a child with clear boundaries and discipline is a profound expression of love, while withholding those boundaries causes lasting harm. A life of absolute freedom, devoid of rules or respect for authority, carries great danger [ביאור שטיינזלץ]. The primary approach among commentators is that a parent who avoids correcting a child ultimately sets them up for failure. Without proper guidance, a child is left vulnerable to bad influences and may ruin their life through unchecked mistakes [רש״י, מצודת דוד, עמנואל הרומי].
Digging deeper into the parent's mindset reveals a psychological reason for withholding discipline. A father might avoid correcting his child out of pity, unable to bear the sight of his child's distress. However, this means the father actually loves his own peace of mind more than his son's future wellbeing. Choosing personal comfort over the child's long-term good is therefore equated with hating the child [מלבי״ם].
In contrast, a truly loving parent takes a proactive, early approach to guidance. This early intervention is understood in a few ways. Some view it as a daily routine, where a father consistently wakes his son and corrects him every single morning [רש״י, אבן עזרא, מלבי״ם]. Others understand it as a metaphor for childhood, the dawn of life. True love means guiding children while they are still young and impressionable, when their character can still be molded toward the right path [רלב״ג, מצודת ציון, מצודת דוד]. Taking this a step further, early intervention involves providing moral instruction before any wrong is done, completely preventing the need for physical discipline later on [אלשיך].
This dynamic between parent and child serves as a model for broader truths. On a spiritual level, it explains why God sometimes brings suffering upon the righteous. Just as a father disciplines a child out of love, the hardships God brings stem from His love, with the ultimate goal of benefiting the person in the end [מלבי״ם]. On a practical level, this concept applies to how one treats the human body. Just as raising a child requires discipline without excessive harshness, maintaining the physical body requires care without unnecessary torment. A strong, healthy body is essential to carry the responsibilities of the Torah and the commandments, making any unjustified harm to oneself an act of foolishness [עמנואל הרומי].