Do you think reading Zeng Guofan's letter is useful?

Teaching you to be a good person is useful, but it has little practical significance and has nothing to do with Zeng Guofan's own success. In reality, Zeng Guofan was not like this at all: he killed people without blinking an eye, vowed to surrender his soldiers to live, but was ashamed of his treachery and killing each other; In order to defeat the Taiping Army, he spared no expense in friendly cooperation with the British and French invaders who were attacking the Qing emperor. Colleagues called him shameless, but he said it didn't matter.