Weimar period is the mature period of Herder's thought. She continued to collect folk songs, studied many subjects and wrote many works.

Held's works include literature and aesthetics, music and painting, language and linguistics, theology and philosophy, history and geography, education and psychology, medicine and ethnology, geology and botany. In all these aspects, Herder put forward his own opinions, but the basic ideas that run through all his works are totalitarianism, democracy and historicism. These three are an inseparable whole, and their goal is to make people become real people, that is, to realize the ideal that human nature can be fully developed.