The ancient poem "Jiu Si"

Zhu You, a famous Neo-Confucianist in Song Dynasty, wrote a poem "Jiu Si", which has always been praised.

Four sentences in the whole poem:

"People's learning lies in thinking, thinking to know right and wrong. But when you are familiar with it, you will naturally think about it. "

Zhu Fuzi's thinking is the eyes and soul of poetry. The dialectical relationship between thinking and learning is expounded. Thinking is the premise of learning, learning is the result of thinking, and thinking is the necessary means and method of learning. Don't forget to think about everything, thinking can achieve human things.

There is also a poem "Jiu Si" written by Wang Yi in the Han Dynasty, which is very long. Which one are you talking about?