In the absence of psychology before people do not have the concept of mental illness, psychology is to help psychologists in the study of human behavior, temperament, mental characteristics, emotional rules to facilitate communication between psychologists, not necessarily applicable to everyone. I remember when I was in college, the word “depression” came out, and immediately “depression” rang out all over the country. And people have an instinct to unconsciously seek proof, when learning a new knowledge (psychology), will automatically find their own position, the results found with their own similarities on the right seat. If you sit in the “depression” seat. Your depressive behavior will be infinitely magnified by your inner perception, and the happy times will be naturally reduced, and you will find that you are more and more like what you judge yourself to be. Many times it is the concept that comes first and the facts that come second. When you feel depressed, you focus more on the response to your depressed performance in front of people around you, and even ignore the appreciation, approval and praise for your happy performance. The feeling of depression is likely generated by yourself (after knowing psychology) and projected onto the people around you, when in fact you are seeing inside yourself. Psychology is a system of explanation, but it is not the only one that works best. And people are complex and diverse. Nothing can be generalized by a few terms of psychology, sometimes being generalized is just the result of our active choices, choices just to rationalize our own traits, but if they don’t fit you, don’t trust it (psychology). Another perspective on the world series is not entirely psychological knowledge, it is my own opinion formed after studying philosophy, psychology, sociology, culture and so on. Some views are even very different from psychology, so please bear with your psychology friends, and don’t take it as psychology to learn from your non-psychology friends.