A deep contrast exists between the generous nature of those who possess wisdom and the closed, resistant minds of those who lack it. True wisdom is rarely kept hidden; it naturally seeks to be shared and protected, while foolishness inherently rejects it.
The primary approach among commentators views the words of the wise as a flowing spring. They actively scatter and share their knowledge to teach everyone, including the simple-minded. Because wisdom naturally flows outward, similar to a tool separating wheat from chaff, wise individuals put great effort into sharing their insights with those around them [אמרי דעת]. They are driven by a deep sense of mission. They will offer correction to the wicked and broadcast the truth even when it is rejected, knowing that by doing so, they fulfill their duty and protect their own souls. In fact, doing good becomes such a deeply ingrained habit that the wise sometimes share profound knowledge without even consciously intending to do so [אלשיך].
Beyond simply sharing, the wise treat knowledge with deep reverence. They actively glorify and crown wisdom with honor, making it attractive and beloved to others [רש״י, עמנואל הרומי]. At the same time, this reverence requires them to set clear boundaries and definitions around their knowledge. By doing this, they protect the truth from being twisted or misunderstood by those who lack understanding [מלבי״ם, עמנואל הרומי].
In sharp contrast, the internal state of fools is entirely different. On a basic level, fools simply do not behave like the wise. They have no desire to acquire knowledge, they refuse to learn what is generously offered to them, and they possess no wisdom of their own to share [אבן עזרא, מצודת דוד, ביאור שטיינזלץ].
Furthermore, their internal world is defined by falsehood. While the wise spread truth, the minds of fools are distorted, leading their hearts to imagine and believe things that are simply incorrect and unjust [רש״י, רלב״ג, עמנואל הרומי]. Even when fools possess a basic internal awareness of the rules of wisdom, their physical desires blind them. This internal conflict leaves their hearts unstable and completely lacking a solid foundation [מלבי״ם].
From a psychological perspective, a fool operates out of automatic resistance. When a wise person speaks and shares knowledge, the fool does not even wait for the sentence to end or the concept to be understood. Instead, the fool's heart rushes to a negative judgment, immediately deciding that the words are false. By rejecting truth instantly and without any logical reason, they fully expose their own foolishness [חומת אנך].