thinking about screenwriting

"But, as I have just suggested, I believe that the practice of writing consists in more and more relegating all that schematic operation to the subconscious. The critic that is in every fabulist is like the iceberg—nine-tenths of him is under water. Yeats warned against probing into how and why one writes; he called it “muddying the spring.” He quoted Browning’s lines:

Where the apple reddens never pry—

Lest we lose our Edens, Eve and I."