There are long forests, towering mountain bees, noisy birds and beasts, butterflies in water rocks, flowers and plants rising and falling in spring, summer, autumn and winter, and clouds changing in the morning and evening ... In short, the mountain is beautiful. In this case, if you live in a mountain first and don't know Tao (that is, you only see the beauty outside the mountain and don't appreciate the Tao of the mountain), you can only see the mountain and forget its Tao. On the other hand, if you know first and then live in the mountain (that is, appreciate the way of the mountain and then live in the mountain), you will see the road and forget the mountain. Forget the mountain, forget the road and dazzle your eyes. Therefore, if you can forget the mountain when you see the road, then even in the world of mortals, your heart is quiet and peaceful. If you forget the way when you see the mountain, your heart will be noisy even in the mountain.