The poem embodies the sacrifice of life for righteousness. In life, you will be a hero, and in death, you will be a ghost. Who has never died since ancient times? Keep the loyal heart to reflect the history, the day when the brave soul returns, and watch the spiritual flag in the sky.

1. Live as a hero among men, and die as a hero among ghosts: It means to live as a hero among men, and die as a hero among ghosts. From "Summer Quatrains", "Summer Quatrains" is a five-character quatrain composed by Li Qingzhao, a poet in the Song Dynasty. This is a nostalgic poem that uses the past to satirize the present and express grief and indignation. The first two sentences of the poem are astonishing and speak directly from the heart, proposing that people should "be born as heroes", make contributions to the country, and serve the court; "die" should also be "ghost heroes", so as to be worthy of being a good man who stands upright and upright. The deep patriotism burst out and shocked people's hearts. In the last two sentences, the poet praises Xiang Yu's tragic actions to satirize the shameless behavior of those in power in the Southern Song Dynasty who did not want to make progress and lived an ignoble existence. There are only twenty short words in the whole poem, but three allusions are used in succession. It can be said that every word is precious, and there is a sense of righteousness between the lines.

2. Who has never died since ancient times? Keep a loyal heart to reflect history: It means that since ancient times, people are bound to die! If you can be loyal to the country, you will still be able to shine for thousands of years after your death and leave your name in history. It comes from "Crossing Lingding Ocean", which is a poem written by Wen Tianxiang, a minister of the Southern Song Dynasty, when he passed Lingding Ocean in 1279. The first two sentences reflect the poet's review of his life; the middle four sentences closely follow "The fight is rare" and clearly express the author's understanding of the current situation; the last two sentences are the author's unhesitating choice about his own destiny. The whole poem expresses the impassioned patriotic enthusiasm, the high moral integrity and the outlook on life of sacrificing one's life for righteousness. It is a noble expression of the traditional virtues of the Chinese nation.

3. On the day when my soul returns, I will watch the spirit flag in the sky: It means that on the day when my soul returns, I will definitely watch the team of my successors in the sky to resist the Qing army. It comes from "Farewell to the Clouds". "Farewell to the Clouds" is the work of the famous poet Xia Wanchun, a young hero of the Ming Dynasty who resisted the Qing Dynasty. The poem was written when the poet was arrested by Qing soldiers in his hometown of Huating County, Songjiang Prefecture (today's Songjiang, Shanghai). A fatal poem, the poet finally died unyieldingly at the age of seventeen. The whole poem has smooth and clear ideas and ups and downs of emotions. He began to write about the arduous wandering life, and continued to express the sadness and indignation of the loss of his hometown and the broken mountains and rivers. He then turned to express his nostalgia for his hometown and his deep affection for his relatives, and concluded his determination to restore the alliance.

Sacrificing life for justice originally means giving up life and choosing justice. It later refers to sacrificing one's life in order to uphold justice or preserve one's reputation.