What is the relationship between romanticism and (the importance of) knowledge, intellectualism?
For instance, the Enlightenment thinkers put great emphasis on the importance of knowledge. Voltaire said "The ignorance is the greastet illness of the human species" (my translation). Condorcet said ferocity is born in part of ignorance. The Enlightenment thinkers also produced the Encyclopédie, which aimed at gathering all the most advanced human knowledge, synthesized by the great contemporary savants.
On the other hand, to a romanticist like Rousseau, too much knowledge and theory, moves away the human being from their nature, and contributes to their decline. I am not aware of any romantist talking about the importance of knowledge. Rather, it seems to me they insist on (different forms of) mysticism and strong negative emotions. I know there was the movement "Naturphilosophie". Its scientific legitimacy is controversial, though.
This tendency of anti-intellectualism in romanticism is captured in this passage from (Esterhammer, 2011):
Despite the different modes of creativity they invoke, Wordsworth’s Prelude, Coleridge’s “Kubla Khan,” and Blake’s “Introduction” to Songs of Innocence all draw on an image of the poet as natural genius – one who may be untaught or socially marginalized, but to whom, in any case, poetry comes in a spontaneous manner.
Esterhammer, A. (2011). Spontaneity, Immediacy, and Improvisation in Romantic Poetry. A Companion to Romantic Poetry, 321-36.