Making a film means, first of all, to tell a story. That story can be an improbable one, but it should never be banal. It must be dramatic and human. What is drama, after all, but life with the dull bits cut out.

Alfred Hitchcock (1899-1980) English film director
Interview (1962-08) by François Truffaut
    (Source)

Why he avoids making "slice of life" films. Sometimes paraphrased as "Drama is life with the dull bits cut out."

From a series of interviews (with Helen Scott as the translator) of Hitchcock by Truffaut, edited and collected in the Truffaut book Hitchcock: A Definitive Study [Le Cinéma Selon Hitchcock], ch. 4 (1966) [tr. Truffaut (1967)].