Encourage generosity in order for us all benefit from its rewards in this life and in the hereafter.

This hadith compares two types of people - those who are generous and those who are miserly. It explains how the generous person has an expansive attitude towards giving charity, which allows them to give more freely. On the other hand, a miserly person has such a tight grip on their money that they cannot even bring themselves to part with it when they want to. The hadith also mentions coats of mail as an analogy for this behavior - when someone wants to be generous, their coat of mail expands and makes it easier for them; but when someone wants to be stingy, their coat of mail contracts and makes it harder for them. This teaches us that generosity should be encouraged in order for us all benefit from its rewards in this life and in the hereafter.