John Farnam had this quote in a recent post on his mailing list, and I thought it significant.
In a state of tranquillity, wealth, and luxury, our descendants will forget the Art of War and the noble zeal which made their ancestors invincible. Every corruption will be employed to loosen the bond of union which renders our resistance formidable. When the spirit of liberty, which now animates our hearts and gives success to our arms, is extinct, our numbers will accelerate our ruin and render us easy victims to tyranny. —Sam Adams