Crankshaw(1970年),第302页,In a letter to Joseph, the Empress wrote: "What, without a dominant religion? Toleration, indifferentism, are exactly the right means to undermine everything... What other restraint exists? None. Neither the gallows nor the wheel... I speak politically now, not as a Christian. Nothing is so necessary and beneficial as religion. Would you allow everyone to act according to his fantasy? If there were no fixed cult, no subjection to the Church, where should we be? The law of might would take command." Crankshaw, Edward. Maria Theresa. New York: Viking Press. 1970. ISBN 0582107849.