Indications: instructions, instructions. (Yu): Lu You's youngest son. Learning: refers to reading and learning, that is, learning. Legacy: spare no effort: spare no effort, without reservation, spare no effort, do your best. Youth: adolescence. Time: Time spent (doing things). Start: Only. Paper: books. Finally: After all. Sleep: feel, feel. Shallow: shallow, shallow. Know nothing: a deep and thorough understanding. Good: practice. Bow (G not gōng) line: personal practice.
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The ancients learned nothing, and it takes time to grow old. What you get on paper is so shallow that you never know what you have to do. The ancients always tried their best to learn. Even so, they worked hard from childhood until they were old. After all, the knowledge gained from books is superficial. In the final analysis, if you want to know the nature of things or things, you still have to rely on personal practice.