"Man's greatest enemy is not others but himself", which celebrity said! ?

Many people have said similar things, such as Napoleon and Gorky. Almost all thinkers and philosophers have put forward similar views. It's really hard to determine who is the original, but it doesn't matter anymore. People are always more likely to find the shortcomings of others, but it is difficult to find their own. Therefore, the most difficult thing for people to understand is themselves, so they need others to know themselves as a mirror. Everyone has his own advantages and disadvantages. Only by fully understanding can we foster strengths and avoid weaknesses. Only by giving full play to one's abilities and facing oneself squarely can one gain real self-confidence and determination. Inferiority and conceit will become internal obstacles, leading to ultimate failure, both of which lack real self-confidence. People's desires, greed, anger, hatred, jealousy, arrogance, laziness, cowardice, fear, anxiety and sadness all come from their own hearts. Once they are confused, they will lose themselves. The heart is deep. You can destroy yourself or save yourself. Only you can really hurt yourself. The pain brought by others is only an instant and an event. If you blindly immerse yourself in tragedy, that is the real tragedy. Only if you give up, you really lose. It is the will, not the result, that really fails. What really makes you tired is your mood, not your steps. Many times it is not the thing itself that is difficult, but your own heart. If you want to surpass it, you must first overcome the obstacles in your heart. From a physiological point of view, many actions and behaviors of people are actually done unconsciously and subconsciously, and you have done it almost without thinking. Sometimes you do one thing while thinking about something else, and you don't remember why you didn't finish it or the process at all, but it seems that you will do it naturally. Sometimes you don't think about something deliberately, but you can't help it. Just think of those things, that is, those things that appear in your brain in advance and are then perceived by your consciousness. Have you ever been in a situation where sometimes you can't control your emotions, thoughts and even your body? Sometimes, it seems that another person is controlling himself (is it subconscious or pre-conscious? ). Contradictions, chaos, out of control ... Sometimes I suddenly stop on the road and want to ask myself why I am here and what I am doing. There are some things I obviously want to do, but my body doesn't listen to me; There are some things you don't want to do, but your body will act involuntarily. Some things are simple, but you can't do it yourself. There are some things you know are wrong, but you have to stick to them.