The problem of evil is a question that many philosophers have attempted to explain in their own perspective. This particular problem has led many theorists to question the existence of evil in the world when it is claimed that God is omnibenevolent, omniscient, and omnipotent. Because this challenging inquiry was enlightened, it questioned the existence of God and His power to be good. In this article I will support Voltaire's thesis in Candide against Leibniz's theory of optimism in the Essays on the Goodness of God, the Freedom of Man and the Origin of Evil. François-Marie Arouet, known as Voltaire, was a man who flourished in the French Enlightenment – ​​an era in which society strives to improve through reason and knowledge – in the 18th century. During this period, France was still under strongly Catholic rule, which influenced the political structure of the country. However, this did not stop Voltaire from asserting his perspective on Christianity. “[Christianity] is surely the most ridiculous, most absurd, and bloodiest religion that has ever infected this world” (Mathews). Unlike many philosophers before him, Voltaire did not live under the grave threat that the Church would break down his door and exterminate him for heresy; however, it could have damaged his reputation. Many philosophers still did not appreciate the presence of the Church everywhere in France; therefore, some have criticized the church and the literary passages that support theological thinking. For example, Voltaire wrote a satire, Candide, against Gottfried Wilhelm von Leibniz's Essays on the Goodness of God, the Freedom of Man, and the Origin of Evil. Voltaire scoffed at the statement: "metaphysical considerations concern the nature of the possible and the... medium of paper... materials of his time, it would be very likely that he would use it and compose a different perspective on the problem of evil. Voltaire , instead, he would have acquired more concrete evidence to prove his thesis: this suffering does not come from God himself, but from natural causes proven by science. So, if God was not the cause of these events, then it is not God who seeks to prove a point and create the world, thus crippling Leibniz's idea of ​​God's goodness, man's freedom and the origin of evil This question of why evil exists in the world should not have been answered because God decided it was the best thing for the world; there is suffering everywhere and if it were judged as a whole rather than as an event, then there would be little or no good in the world.