"Wise men don't learn, don't ask, don't know" comes from Wang Chong's On Shi Hengzhi in Han Dynasty. On Shi Hengzhi divides things into two categories: knowable and unknowable, and accordingly emphasizes understanding these two categories through careful thinking and diligent study. This proposition contains materialistic factors that attach importance to practical experience and criticizes the theory that "saints are born with knowledge" at that time.
The meaning of "a wise man learns if he doesn't ask, and he doesn't know if he doesn't know" means that even a wise man won't understand if he doesn't study or ask for advice. It shows that learning is the only way to acquire knowledge and increase wisdom.
From the original text of On Shi Hengzhi:
During the Spring and Autumn Period, Qing met the doctor, and when he saw different thoughts and heard different words, good was auspicious blessing, and evil was judged as evil. Being able to predict good or bad in advance, considering things that haven't appeared long ago, and not having supernatural intelligence are all because of perceiving omens. Now use it to discuss, then what you can know can be predicted through thinking.
You don't know what you can't think without learning. You can know for yourself if you don't learn, and you can understand for yourself if you don't ask. There are no examples since ancient times.
It is not difficult to understand what you can know, no matter how big it is, just think about it carefully; What you can't know, no matter how small, is not easy to understand even if you study hard and ask others. Therefore, even a smart person will not achieve anything if he doesn't study, and he won't know if he doesn't ask others.