“This society [Jesuits] has been a greater calamity to mankind than the French Revolution, or Napoleon's despotism or ideology. It has obstructed the progress of reformation and the improvement of the human mind in society much longer and more fatally.{Letter to Thomas Jefferson, November 4, 1816. Adams wrote an anonymous 4 volume work on the destructive history of the Jesuits}”

“I almost shudder at the thought of alluding to the most fatal example of the abuses of grief which the history of mankind has preserved - the Cross. Consider what calamities that engine of grief has produced! With the rational respect that is due to it, knavish priests have added prostitutions of it, that fill or might fill the blackest and bloodiest pages of human history.{Letter to Thomas Jefferson, September 3, 1816]”

“Let the human mind loose. It must be loose. It will be loose. Superstition and dogmatism cannot confine it.{Letter to his son and 6th US president, John Quincy Adams, November 13 1816}”

“Government has no right to hurt a hair on the head of an Atheist for his Opinions. Let him have a care of his Practices.{Letter to his son and future president, John Quincy Adams, 16 June 1816}”

“Can a free government possibly exist with the Roman Catholic religion?{Letter to Thomas Jefferson, May 19, 1821}”

“Abuse of words has been the great instrument of sophistry and chicanery, of party, faction, and division of society. ”

“Thomas Jefferson still survives”