Let me talk about personal reasons. First, a person can only be useful if he keeps his word, and others will convince you if he keeps his word, and you can achieve great things. If you don't keep your word, others will gradually leave you, and you can't achieve great things. This involves the relationship between big interests and small interests. People who don't keep their promises may get temporary benefits, but they lose people's hearts. A trustworthy person may lose temporary benefits, but gain people's hearts. The so-called popular world.

Second, only when the country wins the trust of the people can the people think of the country and the country can maintain long-term stability; If the country loses trust in the people, the people will lose confidence in the country and only care about their own interests. In the long run, folk customs will be chaotic, which will eventually lead to the decline or even extinction of the country.

"If a country does not believe, it will decline" can also be understood as the same meaning as a person who does not believe.

If it is a political topic, first briefly explain the meaning of these two sentences (personally, most of them mean 1. There is also 2.2, which is unlikely to mean 2. 1. ), and then write: in daily life, you should keep your word, keep your promise, and be a truly useful person to society.