Ingmar Bergman (1918-2007)
'The basis for all improvisation must be preparation. If I haven't prepared, I can't improvise. If I've made careful preparations I can always improvise. Then I know I have something to fall back on. What I detest is formlessness. That terrifies me. It is seldom that mere formlessness in a work of art conveys anything vivid. More often it gives an impression of effort. But a combination of improvisation and planning — that's good'. - Ingmar Bergman