The text addresses those whose faith is shaped by books and fashion; Priestley draws an analogy between the skepticism of educated men and the credulity of the masses. He again argues for the existence of God using what Schofield calls "the classic argument from design ... leading from the necessary existence of a creator-designer to his self-comprehension, eternal existence, infinite power, omnipresence, and boundless benevolence." In the three volumes, Priestley discusses, among many other works, Baron d'Holbach's "Systeme de la Nature", often called the "bible of atheism." He claimed that d'Holbach's "energy of nature," though it lacked intelligence or purpose, was really a description of God. Priestley believed that David Hume's style in the "Dialogues Concerning Natural Religion" (1779) was just as dangerous as its ideas; he feared the open-endedness of the Humean dialogue.