This study deals with the contemporary relevance of Diderot’s ideas in matters of education. Neither a treatise nor an essay, Diderot’s practical observations are scattered throughout his letter correspondence and his fictional novels. According to our enquiry, the more physiological aspects are dealt with in the Encyclopedia. We will see that Diderot’s position is unconventional but does not necessarily follow in Rousseau’s wake. He rather tries to reach a fair balance between freedom and duty, focusing on women and sexual emancipation.