Here is an excerpt Barthes used in The Neutral from Gustav Janouch's book, Conversations with Kafka. This is the response Kafka allegedly gave after Janouch showed him a sonnet he was working on.

"You describe the poet as a great and wonderful man whose feet are on the ground, while his head disappears in the clouds. Of course, that is a perfectly ordinary image drawn within the intellectual framework of lower-middle-class convention. It is an illusion based on wish fulfillment, which has nothing in common with reality. In fact, the poet is always much smaller and weaker than the social average. Therefore he feels the burden of earthly existence much more intensely and strongly than other men. For him personally his song is only a scream. Art for the artist is only suffering, through which he releases himself for further suffering. He is not a giant, but only a more or less brightly plumaged bird in the cage of his existence."