Progressivism is a broad philosophy based on the Idea of Progress, which asserts that advancement in science, technology, economic development, and social organization are vital to improve the human condition. Progressivism became highly significant during the Age of Enlightenment in Europe, out of the belief that Europe was demonstrating that societies could progress in civility from barbaric conditions to civilization through strengthening the basis of empirical knowledge as the foundation of society. Figures of the Enlightenment believed that progress had universal application to all societies and that these ideas would spread across the world from Europe. Sociologist Robert Nisbet finds that "No single idea has been more important than ... the Idea of Progress in Western civilization for three thousand years" and defines five "crucial premises" of the Idea of Progress as being: value of the past, nobility of Western civilization, worth of economic/technological growth, faith in reason and scientific/scholarly knowledge obtained through reason, intrinsic importance and worth of life on earth. Beyond this, the meanings of progressivism have varied over time and from different perspectives.