When you're in a groove, you're not spinning your wheels; you're moving forward in a straight and narrow path without pauses or hitches. You're unwavering, undeviating, and unparalleled in your purpose. A groove is the best place in the world. Because when you are in it, you have the freedom to explore, where everything you question leads you to new avenues and new routes.

The Creative Habit: Learn It and Use It for Life (ed. Simon and Schuster, 2003)