Graham Greene said this quote
“ The conditions of writing change absolutely between the first novel and the second: the first is an adventure, the second is a duty. The first is like a sprint which leaves you exhausted and triumphant beside the track. With the second the writer has been transformed into a long-distance runner - the finishing tape is out of sight, at the end of life. He must guard his energies and plan ahead. A long endurance is more exhausting than a sprint, and less heroic. ”