I found a resource where they list a lot of John Adams' letters and they are amazing. He's brilliant, and was suspicious of America relying too much on Democracy because he saw what came of the mobs in the French Revolution:

“Remember Democracy never lasts long. It soon wastes exhausts and murders itself. There never was a Democracy Yet, that did not commit suicide.” - John Adams

https://providencefoundation.com/letters-of-john-quincy-adams-to-his-son-on-the-bible-and-its-teachings/