What other sentences describe the time that is gone forever?

1, an inch of time is worth an inch of gold, and an inch of gold can't buy an inch of time.

2. The light is a chicken at midnight. That is, when a man studies, his black hair doesn't know how to study early, and his white hair regrets studying late.

3. It is difficult for a teenager to learn, but an inch of time is not light.

My life is limited, but so is my knowledge.

If young people don't work hard, old people will be sad.

1, an inch of time is worth an inch of gold, but an inch of gold is hard to buy.

Interpretation: an inch of time is an inch of gold. Metaphor time is very precious.

Source: "Huai Nan Zi Yuan Dao Xun": "Therefore, the sage is not expensive, and it is more important than the yin of the inch, which is rare and easy to lose.

2. The light is a chicken at midnight. That is, when a man studies, his black hair doesn't know how to study early, and his white hair regrets studying late.

Interpretation: Every midnight is the best time for boys to study.

Source: Yan Zhenqing (Tang).

3. It is difficult for a teenager to learn, but an inch of time is not light.

Interpretation: The days of youth are easy to pass away, but learning is difficult to succeed, so cherish every inch of time and don't let it go easily. Before I woke up from the bright spring, the leaves of plane trees rustled in the autumn wind in front of the steps.

Source: The first and second sentences of Zhu Gu's ancient poem "Poem of Encouraging Learning".

My life is limited, but so is my knowledge.

Interpretation: Life is limited, but knowledge is infinite. Pursuing infinite knowledge with limited life is doomed to failure. Explain that everything should not be absolute, enough is enough. There will always be things you can't reach, so why be so demanding?

Source: From "Zhuangzi's Inner Chapter The Third Master of Health"

If young people don't work hard, old people will be sad.

Interpretation: If you don't work hard when you are young, it's useless to be sad when you are old.

Source: "Yuefu Long Song Poem": "When will a hundred rivers go east to the sea and return to the West? If you don't work hard, the boss will be sad. "