It should be "a promise is a promise." It means that if you think or describe things easily, you will encounter more trouble when you do them. Educate us not to make promises easily. As long as we make promises, we must earnestly practice them and never break our promises.

Make a light promise, keep silent: from chapter 63 of Laozi: inaction, inaction and tasteless. Good for evil, big or small. The chart is easier and more difficult than it, because it is more detailed than it; If the world is difficult, it will be easy; Great things in the world must be done in the details. Therefore, a saint is not great after all, so he can become great. It is easy and difficult for a husband who promises lightly to break his promise. It is difficult to be a saint, so there is no difficulty in the end.