"God who gave us life gave us liberty. Can the liberties of a nation be secure when we have removed a conviction that those liberties are the gift of God?" - Thomas Jefferson, 1781 (engraved on the Jefferson Memorial).
"The Constitution... is a mere thing of wax in the hand of the judiciary, which they may twist and shape into any form they please." - Thomas Jefferson, 1819.
"I therefore beg leave to move -- that henceforth, prayers imploring the assistance of Heaven and its blessing on our deliberations, be held in this Assembly every morning before we proceed to business, and that one or more of the clergy of this city be requested to officiate in that service." - Benjamin Franklin, 1797 (Constitutional Convention).
"We have staked the whole future of American civilization, not upon the power of government, far from it. We have staked the future of all of our political institutions upon the capacity of each and all of us to govern ourselves, to control ourselves, to sustain ourselves according to the ten commandments." - James Madison
Bill's chapter on spirituality, secularism and it's negative effect on society is just terrific, most certainly the best part of the book.