Happiness is always short, pain is always long, and the difference between short and long depends entirely on the mind. Happiness is a state of mind; Desolation is also a state of mind. And even if you understand it, it is often difficult to control your emotions. We are often sad, sad because of loneliness. We have been lonely because our backs are turned to the sun. If you can let go of your sadness and let your heart wander freely, you can get rid of the pain, and this somewhat gloomy world will become better and brighter.