A light promise will lead to a lack of faith, which means that a promise made easily will inevitably lack credibility. The whole sentence is "A light promise will lead to a lack of faith, and what is easy will be difficult." This sentence is said by Lao Tzu. It can be said Very philosophical. The former sentence "A light promise will inevitably lead to a lack of trust" is easier to understand, which means that a promise made easily will inevitably lack credibility. The latter sentence "What is easy is often difficult" is a bit difficult to understand literally. Combined with the context of Lao Tzu at that time, we know that this In other words, if you think or describe something as easy, it will be more troublesome to actually do it. The first half of the sentence educates us not to make promises easily. As long as we make a promise, we must fulfill it seriously and not lose faith. The second half of the sentence educates us not to underestimate the things we encounter or our opponents, otherwise we will definitely do it. When trouble occurs during the process, it fails due to lack of stamina and necessary preparation