"美国的天才不在于它的行政人员或立法机构，也不在于它的外交官或作家或大学或教堂或客厅，甚至不在于它的报纸或发明家，而是始终在普通民众中。"

Simplified Meaning:

The quote is saying that the true strength and greatness of the United States come from ordinary people rather than from leaders, politicians, writers, scholars, or even inventors. Imagine a small town where everyone helps each other: neighbors share food, friends support one another through hard times, and families work together to improve their community. This caring and cooperation among everyday people are what make the town strong and wonderful. In a bigger sense, America's power and success come from millions of regular folks working, caring, and doing their part. Think about historical movements like the Civil Rights Movement, which was driven by ordinary citizens, not just famous leaders. This shows how common people have the greatest impact when they come together to make a change. So, anyone can apply this wisdom by understanding that their contributions, no matter how small, are valuable. By working together and supporting each other, the collective effort of everyday people can achieve amazing things and create a better society.