Voltaire's best-known histories are "The Age of Louis XIV" (1751), and his "Essay on the Customs and the Spirit of the Nations" (1756). He broke from the tradition of narrating diplomatic and military events, and emphasized customs, social history and achievements in the arts and sciences. He was the first scholar to make a serious attempt to write the history of the world, eliminating theological frameworks, and emphasizing economics, culture and political history. Although he repeatedly warned against political bias on the part of the historian, he did not miss many opportunities to expose the intolerance and frauds of the church over the ages. Voltaire advised scholars that anything contradicting the normal course of nature was not to be believed. Although he found evil in the historical record, he fervently believed reason and educating the illiterate masses would lead to progress.