Zheng Banqiao's couplet "All rivers run into the sea, with great tolerance;" The wall stands thousands of miles, and there is no desire. "It means: the width of the sea can accommodate many rivers; There is a metaphor that a broad-minded person can tolerate everything; Or a metaphor for a company's huge resources. The towering cliff stands tall because it has no secular desire; It is a metaphor that people can reach the realm of righteousness (rigidity) without worldly desires.