It's a critical fallacy of our times... that a writer should 'grow,' 'change,' or 'develop.' This fallacy causes us to expect from children or radishes: 'grow,' or there's something wrong with you. But writers are not radishes. If you look at what most writers actually do, it resembles a theme with variations more than it does the popular notion of growth.

Second Words: Selected Critical Prose 1960-1982 (1982)