Your biggest enemy is yourself, which really makes sense, because, well, you can get great inspiration from reading some historical books, such as The Romance of the Three Kingdoms. For example, some people may succeed at first through internal or external environment, or through their own five forces, and then respect and defeat the enemy. For example, you are like Guan Yu. It can be said that no one in the world can beat you. But in the end, he can blame her death on his headstrong personality, so it makes sense to say that the biggest and worst enemy is himself. There are many situations in real life. At first, all these factors can be solved, and finally exercise becomes a failure caused by personal personality differences.