They all say that they don't work hard when they are young and strong. It's no use being sad when you are old.

The source of the long line of Yuefu poems: "When will a hundred rivers go east to the sea and return to the West?" "Young people will be sad if they don't work hard." Han Yuefu wrote about dynasties and the Han Dynasty.

It's a long way to go, Xiu Yuan Xi, Xiu Yuan Xi. I'll go up and down.

From the 97th sentence of Qu Yuan's Lisao. Combined with the context, it can be understood as: the road is narrow and the road is long. I want to seek the sun in my heart up and down. Combined with the context, it expresses Qu Yuan's positive and enterprising mentality of "exploring the road before it is completely dark".

Now it is generally extended to: lose no time to find the right way to solve the problems faced.

My life is limited, but so is my knowledge.

From "Zhuangzi's Inner Chapter, the Third Health-keeping Proposition"

Life is limited, but knowledge is infinite, so we should keep learning.

A Long Song of Yuefu is a folk poem, selected from Yuefu. The first six sentences of this poem reveal the natural law of spring glory and autumn decline, and pave the way for cherishing time too much with the method of supporting things. With profound and ingenious metaphors, the seven or eight sentences reveal the objective law that time is like running water, which will not go backwards and people will not be young when they are old, thus highlighting the central meaning that people should cherish precious time. The last two sentences are life maxims summed up by ancient poets from practice, which still have positive educational significance for today's teenagers. The whole poem looks dull, all spoken words of the year, but if you appreciate it carefully, you will find that it is meaningful, but it contains extraordinary content in simple sentences. The words are shallow and profound, light and full of charm.