Admissions of doubt

The words of: A S Byatt, Anne Tyler, Anthony Doerr, Candia McWilliam, Evelyn Waugh, Fyodor Dostoyevsky, Gabriel García Márquez, Janice Galloway, John Macmurray, Julian Barnes, Margaret Drabble, Penelope Fitzgerald, Raymond Tallis, Richard Holmes, Robert Louis Stevenson, Roy Porter, T S Eliot, William Carlos Williams.