Who was the French philosopher whose belief in the goodness nature paved the way for romanticism?

The French philosopher who believed in the inherent goodness of nature and laid the groundwork for romanticism was Jean-Jacques Rousseau. He argued that society corrupts the natural goodness of humans and emphasized the importance of emotion, individual experience, and the connection to nature. His ideas significantly influenced the romantic movement, which celebrated these themes in art, literature, and philosophy. Rousseau's works encouraged a shift away from rationalism towards a more emotional and intuitive understanding of human existence.