Roses are always so delicate and charming, but they always have sharp thorns. The poisonous snake always reminds people of its ugly appearance, sharp fangs, flaming core and deadly venom, but snake venom is also an expensive life-saving medicine. Therefore, everything in the world has its good and bad, and so do we humans. We should know ourselves and give full play to our strengths to make up for our shortcomings. Qin Shihuang was brave and powerful. He led the seven countries with his infinite strength and made the society take a big step forward. But he doesn't know that his heart is as hard as a stone, and his policy is more cruel than a tiger. The people's resentment accumulated for a long time and was finally overthrown in the Qin Dynasty in Qin Ershi. In Jieting World War I, Ma Su was arrogant, blindly underestimating his enemy, and laughed at Wang Ping's view of true daughter and Sima Yi's life. If these people can know their own shortcomings, which will bring serious consequences to their lives, they can still be corrected even if these shortcomings have reached a deep-rooted level. I'm afraid some people will be complacent and feel good about themselves if they can't find their own shortcomings. Qi Weiwang was initially deceived by treacherous court officials. He was not a wise king. But when Zou Ji lied that he had given Wei Qi advice, Qi Weiwang suddenly woke up and offered a reward for advice, and finally got a good result. Although he wanted to talk, Qi Weiwang was able to find his own shortcomings and correct them in time, and finally became a wise king. Li is a village doctor in Miao village. He is preparing to leave the village for the city. Then the villagers will get sick and get no treatment. If she thinks she only knows a little medical skill, belittles herself too much and really leaves, then many villagers will suffer from this disease. Therefore, we should not only be able to find our own shortcomings and correct them, but also know our own advantages and make use of them. Just seeing the beauty of roses will sting your hands; If you only see the thorns of roses, you will miss the visual enjoyment. If we only see the horrible appearance and deadly venom of poisonous snakes, we will waste the precious drug wealth of venom. If you only see the medicinal value of highly toxic snake venom, you may lose your life. Things are diverse, so we should fully understand ourselves and the world. Only by knowing ourselves and ourselves can we be invincible.