It’s what Lao Tzu said, which means that promises made easily must lack credibility. From Chapter 63 of "Laozi": If a husband makes a promise lightly, he will be distrustful; if there is anything easy, there will be many difficulties.

A light promise will lead to little faith.

From Chapter 63 of "Laozi": To do nothing, to do nothing, to taste nothing. No matter how big or small, report grievances with virtue. The picture is more difficult than the easy, and the details are greater than the details; the difficult things in the world must be done in the easy; the great things in the world must be done in the details. Therefore, the saint is not great in the end, so he can become great. If a husband makes a promise lightly, he will be distrustful; if it is easy, it will be difficult. Therefore, it is still difficult for the sage, so it will not be difficult in the end.

Translation

Make a difference with an attitude of inaction, handle affairs in a way that does not cause trouble, and appreciate the social atmosphere in a dull and boring way. Deal with small things with the attitude of dealing with big things, and treat the minorities with the same attitude as the majority. Use moral policies to resolve people's grievances. If you want to solve a problem, you have to start when it's easy. To accomplish great things, you must start from small things. Because the difficulties in the world are easy to solve when they first arise. The great things in the world are insignificant at the beginning. Therefore, saints never covet great achievements, so they can achieve great achievements. Those who make promises easily are bound to rarely be able to fulfill them. Those who take things too easy are bound to encounter many difficulties. Therefore, the sage always imagines things to be more difficult, so in the end there is no difficulty that cannot be solved.

What does it tell us that a light promise will lead to a lack of faith?

It tells us that we must be true to our words and be resolute in our deeds, and never make promises easily. As long as you make a promise, you must fulfill it seriously, don't lose your faith, pay attention to the promise, and make a promise worth a thousand dollars!