Be mindful when making decisions related to our worldly affairs and not act hastily without considering all aspects involved.

This hadith highlights the importance of having knowledge and understanding when it comes to worldly affairs. It tells us that we should not be too quick to abandon a practice without fully understanding its implications. In this case, the people were grafting trees but stopped after Prophet Muhammad's advice. However, they soon realized that their yield decreased as a result and asked him what went wrong with their trees. He replied by saying that they have better knowledge in the affairs of the world which implies that they should have known better than to stop grafting without fully understanding its consequences. This hadith teaches us to be mindful when making decisions related to our worldly affairs and not act hastily without considering all aspects involved.