A compound sentence with a hypothetical relationship can be explained like this: If people do not consider the long term, then troubles will definitely appear in the near future. The idea is to ask people to have a broad vision and consider the long term. In fact, this is an object preposition sentence, which can be modified like this: "If a person does not worry about the distant future, he must worry about the near future."

This is a famous saying from Confucius. The words come from "The Analects of Confucius·Wei Linggong": "Confucius said: If people have no long-term worries, they must have near-term worries." "The Analects of Confucius is just" quoted: "The worries are not far away, and the worries are coming, so it is called near-term worries." "Xunzi" "Da Lu" says: "Think about things first, and worry about troubles first. Thinking about things first is called taking over, and taking over will make things happen. Worrying about troubles first is called hesitation, and hesitation means disaster will not happen. He who thinks about things after they happen is called hesitation." If you are trapped, the disaster will be irresistible. "Confucianism attaches great importance to people's long-term thinking."