“The heavens declare the glory of God, and the sky proclaims the work of His hands.” Psalm 19:1
Since the 15th century modern philosophy has been marked by a continuing interaction between systems of thought based on a mechanistic, materialistic interpretation of the universe and those founded on a belief in human thought as the only ultimate reality.
Efforts to resolve the dualism of mind and matter, a conflict started by Descartes, continued to engage philosophers during the 17th and 18th centuries while at the same time, the division between science and religious belief also occupied them. The aim was to preserve the essentials of faith in God while also defending the right to think freely. One view called deism saw God as the cause of the great mechanism of the world, a view seen as more harmonious with science than with traditional religion. Natural science at this time was striding ahead, relying on sense perception as well as reason, and thereby discovering the universal laws of nature and physics. Such empirical (observation-based) knowledge appeared to be more certain and valuable than philosophical knowledge based upon reason alone.
After Locke and the empiricists stated their case for logical reasoning processes, philosophers became more skeptical about achieving knowledge that they could be certain was true. Some thinkers who despaired of finding a resolution to dualism embraced skepticism, the doctrine that true knowledge, other than what we experience through the senses, is impossible. Others turned to increasingly radical theories of being and knowledge. Immanuel Kant, probably the most influential of these, sett Western philosophy on a new path it follows today. Kant’s view that knowledge of the world is dependent upon certain innate categories or ideas in the human mind is known as idealism.
Voltaire was the assumed name of François Marie Arouet (1694-1778), a French writer and philosopher, who was one of the leaders of the Enlightenment. Educated by Jesuits, he chose literature as a career, moving in aristocratic circles where he was known for his brilliant and sarcastic wit. His public contempt for the monarchy won him time in the Bastille where his subsequent writing gave eloquent expression of both his anti-Christian views and his rationalistic, deist creed. Although in his earlier works he called for religious toleration, he increasingly attacked French ecclesiastic institutions, bringing him into conflict with powerful church leaders. By 1756, he wrote a study of human progress in which he decried supernaturalism, denounced religion and cursed the power of the clergy, while at the same time declaring his belief in the existence of the deist God. A passionate defender of the persecuted of any belief, Voltaire rejected any form of religion that that constituted fanaticism. He sought to substitute deism, which he considered a purely rational religion, for Christianity, which he considered to be irrational fanaticism. He blamed the world’s woes upon traditional religion. He did not believe that absolute faith, based upon any particular religious text, tradition or revelation was needed to believe in God. Voltaire envisioned a universe based on reason and a respect for nature. He wrote, "What is faith? Is it to believe that which is evident? No. It is perfectly evident to my mind that there exists a necessary, eternal, supreme, and intelligent being. This is no matter of faith, but of reason."
Voltaire viewed the Bible as an outdated legal and/or moral text that was by and large metaphorical, but could still teach some good lessons. He further asserted that it was a work of humans, not a divine gift. These beliefs did not hinder his religious practice, however. He built a chapel on his estate in Ferney and regularly attended religious services. He wrote “If God did not exist, He would have to be invented. But all nature cries aloud that he does exist: that there is a supreme intelligence, an immense power, an admirable order, and everything teaches us our own dependence on it.”
All of Voltaire's works contain memorable passages distinguished by elegance, clarity, and wit. Voltaire's contradictions of character, reflected in his writings, were also noted by his contemporaries. Seemingly able to defend either side of any debate, his contemporaries disagreed whether he appeared distrustful, avaricious and sardonic or generous, enthusiastic, and sentimental. He rejected everything he considered irrational and incomprehensible and called upon his contemporaries to act against intolerance, tyranny, and superstition. His morality rested on a belief in freedom of thought and respect for all individuals. His views made him a central figure in the 18th-century philosophical movement and, as he pleaded for a socially involved type of literature, Voltaire is considered a forerunner of such 20th-century writers as Jean-Paul Sartre and other French existentialists.
Although Voltaire hated Rousseau and saw himself as a rationalistic alternative to Rousseau’s romanticism, it must be noted that both were cited by the French revolutionaries as the “fathers” of their movement. In some ways, this seems odd as Voltaire perceived the French merchant class too small and ineffective, the aristocracy to be parasitic and corrupt, the commoners ignorant and superstitious, and the church as a static force useful only as a counterbalance since its "religious tax" (tithe) helped to create a strong backing for revolutionaries.
Voltaire distrusted democracy, which he saw as encouraging the idiocy of the masses. Far from supporting an American-type experiment, Voltaire believed only an enlightened monarch or absolutist, advised by philosophers like himself (what we might call enlightened despotism), could bring about change as it was in the king's rational interest to improve the power and wealth of his subjects and kingdom and was key to progress and change.
His hatred of religious institutions and his faith in an impersonal God who does not dictate morality may be seen as partially encouraging the Reign of Terror’s execution of church leaders and essentially anyone they deemed unreasonable. Unmoored from objective and transcendent morality, the French revolutionaries found no issue within their conscience against what they were doing. They found resonance for this in Voltaire’s writings for even as he derided violence and war, he advocated for the overthrow of authority without regard for a personal and concerned deity that might judge human actions.
Although Voltaire embraced reason to a much greater degree than Rousseau, his conflicted worldview is just as obvious. Rousseau did not truly believe in God, but he believed church institutions could be used to reshape society to a more naturalistic (and, he thought, healthier) ethos. Voltaire believed in a deity, but hated religious institutions. Yet, oddly, both are sighted as great Enlightenment philosophers and “fathers” of democratic ideas.
Voltaire was a good deal more rational than Rousseau. He recognized that God is visible in the world if we will just admit to His existence. However, whatever his personal issues were, Voltaire felt an intense hatred for the clergy and for all restraining morality that comes from a transcendent source. His another example of great intellect turned to bent purposes and feeding frightening results.