The eminent judge wrote his conclusion about why America was great:
"I sought for the greatness of the United States in her commodious harbors, her ample rivers, her fertile fields, and boundless forests -- and it was not there. I sought for it in her rich mines, her vast world commerce, her public school system and her institutions of higher learning -- and it was not there. I looked for it in her democratic Congress and her matchless Constitution -- and it was not there. Not until I went into the churches of America and heard her pulpits flaming 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."
President Andrew Jackson was of a similar view. He believed America's greatness lay in its Christian faith. As he was laying on his deathbed, President Jackson pointed to a Bible on his night-table and told a friend, "That Book, Sir, is the rock on which our Republic rests."
Abraham Lincoln said this about the Bible:
“In regards to this great Book [the Bible], I have but to say it is the best gift God has given to man. All the good the Savior gave to the world was communicated through this Book. But for it we could not know right from wrong. All things most desirable for man's welfare, here and hereafter, are found portrayed in it." 
 Dag Heward-Mills, BASIC THEOLOGY, (Xulon Press, 2011) p.29. (https://books.google.ca/books?id=_1bduk2_UsMC&pg=PA29&lpg=PA29&dq=Andrew+Jackson+%22That+Book,+Sir,+is+the+rock+on+which+our+Republic+rests%22&source=bl&ots=SIjdjGxfgI&sig=xsMlTtbC3ZgbTG63zOCopdyKzfE&hl=en&sa=X&ved=0ahUKEwiJzo7Pw-vRAhVE6YMKHZi0DMIQ6AEIPzAI#v=onepage&q=Andrew%20Jackson%20%22That%20Book%2C%20Sir%2C%20is%20the%20rock%20on%20which%20our%20Republic%20rests%22&f=false)
 Heward-Mills, p.29.