The primary impact of Enlightenment philosophy on the French Revolution was the promotion of ideals such as liberty, equality, and fraternity. Thinkers like Voltaire, Rousseau, and Montesquieu challenged traditional authority and advocated for reason, individual rights, and government accountability. Their ideas inspired revolutionaries to overthrow the monarchical system and establish a republic based on democratic principles. The Enlightenment also encouraged critical examination of social and political structures, leading to significant changes in French society, including the adoption of the Declaration of the Rights of Man and of the Citizen.