John Adams: Virtue and the survival of a nation

Tripp sent me this:

In 1819, John Adams wrote to Thomas Jefferson:

"Have you ever found in history, one single example of a Nation thoroughly corrupted that was afterwards restored to virtue?...

And without virtue, there can be no political liberty."

John Adams continued:

"Will you tell me how to prevent luxury from producing effeminacy, intoxication, extravagance, vice and folly?...

I believe no effort in favour of virtue is lost."