Goethe and Schiller were father figures to the group of younger writers and thinkers who gravitated to Jena 
. Schiller’s letters On the Aesthetic Education of Man would become a founding document for this new generation of thinkers, who called themselves romantics. article
A pivotal work by Schiller was On the Aesthetic Education of Man in a Series of Letters (Über die ästhetische Erziehung des Menschen in einer Reihe von Briefen), first published 1794, which was inspired by the great disenchantment Schiller felt about the French Revolution, its degeneration into violence and the failure of successive governments to put its ideals into practice. Schiller wrote that "a great moment has found a little people"; he wrote the Letters as a philosophical inquiry into what had gone wrong, and how to prevent such tragedies in the future. In the Letters he asserts that it is possible to elevate the moral character of a people, by first touching their souls with beauty, an idea that is also found in his poem Die Künstler (The Artists): "Only through Beauty's morning-gate, dost thou penetrate the land of knowledge."
On the philosophical side, Letters put forth the notion of der sinnliche Trieb / Sinnestrieb ("the sensuous drive") and Formtrieb ("the formal drive"). In a comment to Immanuel Kant's philosophy, Schiller transcends the dualism between Formtrieb and Sinnestrieb with the notion of Spieltrieb ("the play drive"), derived from, as are a number of other terms, Kant's Critique of the Faculty of Judgment. The conflict between man's material, sensuous nature and his capacity for reason (Formtrieb being the drive to impose conceptual and moral order on the world), Schiller resolves with the happy union of Formtrieb and Sinnestrieb, the "play drive", which for him is synonymous with artistic beauty, or "living form".
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