Maintain traditions while adapting to new circumstances when necessary .

This hadith is about how the pillars in the Prophet's mosque changed over time. During the lifetime of Muhammad, these pillars were made from trunks and twigs from a palm tree. However, during Abu Bakr's caliphate, they decayed and he had to rebuild them with trunks and twigs again. But then during Uthman's caliphate, they decayed again so he built them with bricks instead which still stands today. This teaches us that things change over time but we should always strive to maintain our traditions as much as possible while adapting to new circumstances when necessary. It also shows us that even though something may not last forever, it can still have an impact on future generations if it is done right.