★ If a young man doesn’t work hard, the old man will be miserable.
Source: Han Dynasty Yuefu's "Long Song Xing": "In the green garden, the sunflowers are waiting for the morning dew and the setting sun. The spring is full of beauty, and everything is shining. I am always afraid that the autumn festival is coming, and the yellow flowers and leaves will wither. Baichuan East To the sea, when will we return to the west? If a young man does not work hard, the old man will be sad."
Explanation: This is a poem that encourages people to work hard and make progress as soon as possible. Except for the last two sentences, the poem uses metaphors: It is a good season for the sun to be abundant and all things to grow; in autumn, all things begin to wither and turn yellow. This implies that young people should work hard, otherwise they will not achieve anything. Once the water is gone, time will never come back, which also implies that young people should work hard. Once the years are over, time will not go back. Finally, the central idea is highlighted. Disciple: In vain. People only have one life, and time is equal to everyone. As long as it is wasted, no matter how sad you are when you are old, it will not help. These two sentences have now become idioms.