When Lincoln was a little boy living in Pijiang Bay, Indiana, he not only criticized others, but also laughed at others in his letters and poems. He deliberately put these letters on the only way for others, and one of them indicated that the other party hated him for life.

Lincoln became a practicing lawyer after moving to Springfield, Illinois. He publicly attacked his opponent in the newspaper many times and even almost died.

/kloc-in the autumn of 0/842, Lincoln wrote an anonymous letter to Springfield Daily, mocking James Shelds, a conceited and aggressive local politician. Once the article was published, Shelds immediately became the laughing stock of the whole city. Shamed and angry, he jumped on the horse, found Lincoln and asked for a duel. Lincoln didn't want to take part in the competition, but in order to save face, he had to bite the bullet and agree. Taking advantage of his long arm, he chose a wide sword for the cavalry and asked a graduate of West Point Military Academy about fencing. On the day of the duel, Shelds and Lincoln came to the Mississippi River as agreed and confronted each other on the river bank. They are both ready to fight to the death. Fortunately, at the critical moment, their supporters arrived in time to prevent the tragedy.

This is the most painful lesson in Lincoln's life, and it is also the most precious lesson he learned in life.

Since then, he has never written insulting words or made sarcastic remarks. To be exact, after that, he hardly criticized anyone or anything.

During the Civil War, Lincoln took turns to replace the leaders of the Potomac army-McClellan, Pope, burnside, Hook and Meade-but gradually lost power and influence, making him walk around the room in despair. People in the north are accusing these generals of incompetence, but Lincoln insisted on the principle of "not treating others with evil, being kind to others" and kept silent about it.

One of his mottos is "Don't judge others, lest others judge you".

When Mrs. Lincoln and the people around her sharply criticized the southern rebels, Lincoln said, "Don't be too hard on them. If we were in the same situation, we would do the same thing. " However, if anyone is qualified to complain, it must be Lincoln.