Are there three realms of human behavior? The first is doing things you dislike for the sake of life. The second is only doing what you enjoy to live better. The third is being able to handle all kinds of new things without distinguishing between liking and disliking. So we see that true strong people are actually selfless; they no longer have personal subjective feelings, they have no biases, and they no longer differentiate between likes and dislikes towards things. They can calmly handle all kinds of tasks. Because they have achieved selflessness, they won't conflict with the outside world. Without the self as a reference, there is no chaos; everything that exists is reasonable. Once you reach this third realm, you have no obstacles. "The sea embraces all rivers and is thus great," all stumbling blocks can become your stepping stones, helping you climb higher and see farther. Therefore, in this era, everyone needs a revolution within themselves, to overthrow themselves and rebuild.