Acquiring wisdom depends far less on natural talent than on a person's willingness to accept criticism and guidance. A profound gap exists between someone who stubbornly rejects direction and someone who internalizes it to fuel personal change. A foolish individual actively despises the moral discipline offered to him, dismissing it as entirely worthless [מצודת ציון, מצודת דוד, מלבי״ם, ביאור שטיינזלץ]. The source of this rejected guidance can be understood in several ways. It is often the voice of a biological father or a dedicated teacher [עמנואל הרומי]. Alternatively, it represents the guidance of God; the foolish person ignores divine direction because he is consumed by worldly pursuits and harbors a corrupt heart [אלשיך]. On a deeper, internal level, this rejected voice is the human intellect itself, which the foolish person ignores in order to chase physical desires [עמנואל הרומי].
The refusal to accept moral discipline is rooted in the individual's core nature. Unlike someone who makes a mistake simply because a momentary desire overpowers him, the deeply foolish person is a skeptic. He fundamentally doubts God's providence and the reality of divine justice. Because basic moral discipline relies on a sense of awe and accountability, the skeptic rejects it entirely [מלבי״ם]. This stubborn dismissal blocks any possibility of personal progress, as it is impossible to gain true wisdom without first accepting the boundaries of discipline [רלב״ג].
In sharp contrast stands the person who carefully guards and internalizes constructive criticism [מצודת דוד, ביאור שטיינזלץ]. While basic discipline is rooted in awe, this higher level of criticism is built on logical, rational proofs [מלבי״ם]. By remaining open to these rational arguments, a person becomes sharp-minded and shrewd [אבן עזרא, מצודת ציון, ביאור שטיינזלץ]. The commentators agree that accepting such criticism is an active process of development. Internalizing these lessons pulls a person out of naive ignorance, granting them the cleverness needed to clearly distinguish between good and evil [מלבי״ם]. It serves as the most direct route to acquiring wisdom [רלב״ג]. Remarkably, even if an individual was previously trapped in foolishness and mocked moral boundaries, the simple choice to finally listen and hold onto rational criticism will strip away their past foolishness, ultimately leading them to profound wisdom and a life of integrity [אלשיך, מצודת דוד].