משלי, פרק ט״ו, פסוק כ׳

A person's behavior ripples outward, profoundly shaping how their parents are viewed and treated. There is a sharp contrast between the active joy a wise child brings to a father and the shame a foolish adult brings upon a mother. The wise child in this context is fully grown. Rather than wisdom simply causing happiness as a natural byproduct, this individual actively works to bring joy to his father through good deeds, recognizing this effort as a fundamental principle of wisdom [מלבי״ם]. The father's happiness is distinct, as he possesses the depth to truly appreciate the perfection of his son's wisdom [רלב״ג], especially when he watches him take a place among wise peers [מצודת דוד].

Conversely, the foolish individual is depicted as an independent adult who has entirely cast off the respect and submission owed to parents [מלבי״ם, ביאור שטיינזלץ]. There are differing views on how this fool disgraces his mother. One approach suggests a direct and active abuse. Rather than simply failing to honor her, he actively hurts her with his words [אמרי דעת]. Driven by his own desires, he scorns her whenever she attempts to correct his destructive behavior [מלבי״ם]. Because his foolishness isolates him socially, he ends up directing the bulk of his disrespect and shameful behavior toward the mother, who remains a constant presence in his life [עמנואל הרומי].

Another perspective argues that the fool causes others to disgrace his mother. Mothers naturally tend to show pity, often avoiding harsh discipline when their children are young. Consequently, when the child grows into a foolish adult, society places the blame squarely on the mother, cursing and shaming the woman who raised him [רש״י, מצודת דוד, רלב״ג]. Some even view the son's foolishness as a reflection of a deep flaw or impurity in the mother's own character, assuming he inherited his corrupt nature from her [עמנואל הרומי].

Beyond the standard interpretation, an alternative reading shifts the focus, suggesting that the foolish person is actually the father rather than the son. In this scenario, while a wise son brings joy, a foolish father will treat the child's mother with contempt. He arrogantly takes all the credit for the son's success, completely ignoring that it was the mother's modesty and righteousness that truly brought such a wise child into the world [אלשיך]. On a deeper, symbolic level, this dynamic mirrors the inner human struggle. The father represents the intellect, which the wise person elevates and empowers. The mother represents the physical body and material world, which the fool corrupts and degrades through a relentless pursuit of physical desires [עמנואל הרומי].