Fools who think highly of themselves are not motivated to learn from others. They are not aware that there may be some valuable insight or wisdom they don’t already know.
On the other hand, such people enjoy drawing attention to themselves by talking about whatever happens to be on their mind. They assume that others will be impressed by their knowledge.
ב = לֹא יַחְפֹּץ כְּסִיל בִּתְבוּנָה כִּי אִם בְּהִתְגַּלּוֹת לִבּוֹ
(2) The fool has no wish for wisdom,
except to reveal what is in his mind.
The fool has no wish to gain wisdom if it means admitting that someone else knows something of value that he doesn’t know. Accepting wisdom from others interferes with his sense of self-importance. However, he is all in favor of wisdom if he can can claim it is wisdom that he possesses. By sharing such wisdom, whether true or not, he boosts his own sense of self-importance.
(2) The fool has no wish — לֹא יַחְפֹּץ כְּסִיל
for wisdom —בִּתְבוּנָה
that is in the possession of others.
The only wisdom that interests him is that —כִּי אִם
which he employs in revealing — בְּהִתְגַּלּוֹת
what is in his own mind — לִבּוֹ.
 A student who interrupts the presentation of his teacher may be motivated by the need to appear more knowledgable then he actually is. He would be better off putting off his questions until he has thought them through. (רבינו יונה)
 An alternate interpretation of the proverb is that the fool has no interest in gaining knowledge unless he is forced to face his own ignorance by exposing what is actually in his mind. It is only then that he applies himself to learn what he needs to know. However, that resolve is not likely to last because of his poor character. (רלב”ג)
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