characteristics The nature of Romanticism may be approached from the primary importance of the free expression of the feelings of the artist. The importance the Romantics placed on emotion is summed up in the remark of the German painter Caspar David Friedrich, "the artist's feeling is his law". For William Wordsworth, poetry should begin as "the spontaneous overflow of powerful feelings", which the poet then "recollect[s] in tranquility", evoking a new but corresponding emotion the poet can then mould into art. To express these feelings, it was considered that content of art had to come from the imagination of the artist, with as little interference as possible from "artificial" rules dictating what a work should consist of. Samuel Taylor Coleridge and others believed there were natural laws the imagination—at least of a good creative artist—would unconsciously follow through artistic inspiration if left alone. As well as rules, the influence of models from other works was considered to impede the creator's own imagination, so that originality was essential. The concept of the genius, or artist who was able to produce his own original work through this process of creation from nothingness, is key to Romanticism, and to be derivative was the worst sin. This idea is often called "romantic originality". Translator and prominent Romantic August Wilhelm Schlegel argued in his Lectures on Dramatic Arts and Letters that the most phenomenal power of human nature is its capacity to divide and diverge into opposite directions. Not essential to Romanticism, but so widespread as to be normative, was a strong belief and interest in the importance of nature. This particularly in the effect of nature upon the artist when he is surrounded by it, preferably alone. In contrast to the usually very social art of the Enlightenment, Romantics were distrustful of the human world, and tended to believe a close connection with nature was mentally and morally healthy. Romantic art addressed its audiences with what was intended to be felt as the personal voice of the artist. So, in literature, "much of romantic poetry invited the reader to identify the protagonists with the poets themselves". According to Isaiah Berlin, Romanticism embodied "a new and restless spirit, seeking violently to burst through old and cramping forms, a nervous preoccupation with perpetually changing inner states of consciousness, a longing for the unbounded and the indefinable, for perpetual movement and change, an effort to return to