What are the reasons Foster provides that lead him to believe that most writers do not accidentally create the symbols allusions and patterns you find when you read critically?

Foster argues that writers use craft and intentionality in their work, drawing on their knowledge of literary traditions and techniques to include symbols, allusions, and patterns. He suggests that these elements are deliberate choices made by writers to enhance their storytelling and convey deeper meanings to readers, rather than accidental or unconscious creations.