Appreciation: This is the couplet before Maitreya. The first pair of couplets is "A big belly can accommodate things that are hard to tolerate in the world", which aims to tell us to learn to be tolerant. All rivers run into the sea, with great tolerance. This couplet is very Buddhist. You should guard against arrogance and rashness and learn to be tolerant, so that you can keep laughing.
Source: cloth bag monk: "a big belly can hold things that are difficult to hold in the world;" Laugh often and laugh at ridiculous people in the world. "