What are the three realms of looking at mountains instead of mountains?

The three realms of seeing mountains are: seeing mountains when you are young, and seeing water as water; Looking at mountains in middle age is not mountains, and looking at water is not water; Old people see mountains or mountains, old people see water or water.

Everything in the world exists objectively, and people's understanding is the reflection of objective existence. The subject of knowledge is man, who follows his own heart. The development of cognition has its own laws, and practice determines cognition. In other words, people's understanding of everything in the world is gradually deepened in the process of practice.

Life:

In life, nine times out of ten, you don't need to struggle and waste a lot of time. Rather than this, it is better to be open-minded and calm. People live in a state of mind and are hard to be confused.

Life is nothing more than smiling at others and then making them smile. Only when you have seen all kinds of life and tasted the warmth and coldness of the world can you live freely.