The original text is: To study, a beggar scholar should be ambitious, knowledgeable and persistent. Aspiring and unwilling to be indecent; If you have knowledge, you know that knowledge is infinite, and you dare not sell yourself short. Such as Hebo watching the sea, such as a well frog peeping into the sky, no one knows; Nothing is impossible if you have perseverance. These three are indispensable. "This sentence comes from Zeng Guopan's Family Instructions, and the central idea is the three keys to reading.

It means: when reading, intellectuals should have ambition, knowledge and perseverance. If you are ambitious, you will never be content with the bottom. If you have knowledge, you know that knowledge is endless and you dare not be satisfied with a little income; For example, seeing the sea with Hebo's eyes and peeping at the sky with frogs in the well are all reasons for ignorance. Nothing is impossible as long as you have perseverance. These three aspects are indispensable.

Zeng Guofan was a controversial figure in the late Qing Dynasty. He has both the reputation of a famous minister of ZTE and the notoriety of "traitor". No matter who admires or despises him, his letters from home are highly praised. It can be seen that his letter from home is not only a collection of letters recording his daily life, but also a book with the wisdom of treating people and educating children.

References:

Baidu Encyclopedia-Zeng Guo Pan Jiaxun