You don't realize what a strain it is on the nerves to write or think-of-writing all day long, and to sleep full of nervous dreams, and to wake up not knowing who one is: this all stems from anxiety about finishing the book, about time 'growing short', etc., and the perpetual strain of invention.
Jack KerouacMarylou was watching Dean as she had watched him clear across the country and back, out of the corner of her eye--with a sullen, sad air, as though she wanted to cut off his head and hide it in her closet, an envious and rueful love of him so amazingly himself, all raging and sniffy and crazy-wayed, a smile of tender dotage but also sinister envy that frightened me about her, a love she knew would never bear fruit because when she looked at his hangjawed bony face with its male self-containment and absentmindedness she knew he was too mad.
Jack Kerouac