"All rivers run into the sea, with great tolerance; The wall stands a thousand miles, and it is just without desire. It's a famous saying of Lin Zexu.

"Being rigid without desire" means not allowing people to have desires, but to restrain their own selfish desires. Restrain your own selfish desires, you can be indifferent; If you control your own selfish desires, you will live forever. Make people like pines and cypresses, not afraid of dark clouds, not afraid of wind and rain, standing in the world and never breaking.