The document argues that natural science and reason can explain all aspects of life, including human society, and that progress is possible through applying the scientific method. It notes that Enlightenment thinking impacted the urban middle class and aristocracy in Europe but had little effect on urban poor and peasants who were more focused on survival. The document also defines a philosophe as a thinker unconstrained by religion who was critical of nobility and clergy and questioned human nature, government, and advocated for freedom, individuality, and social improvements.