The so-called knowledge in the original text is in things, and words want to reach my knowledge, but poverty is in things. Cover the soul of the human heart, know everything, and everything in the world is reasonable. Because reason is not poor, its knowledge is inexhaustible.

Source Chapter 5 of University Biography

The way to acquire knowledge is to know and study things, that is to say, to acquire knowledge, we must contact and study things. Everyone's mind has cognitive ability, and everything in the world has certain principles. Only these principles are not fully understood, so knowledge is very limited.