In the 1830's, French diplomat Alexis de Tocqueville toured America. When his tour had been completed, he made this observation:

"I sought for the key to the greatness of America in her harbors…; in her fertile fields and boundless forests; in her rich mines and vast world commerce; in her public school system and institutions of learning. I sought for it in her democratic Congress and in her matchless Constitution. Not until I went into the churches of America and heard her pulpits aflame with righteousness did I understand the secret of her genius and power. America is great because America is good, and if America ever ceases to be good, America will cease to be great."