"The key to flow is to pursue an activity for its own sake, not for the rewards it brings." ā Susan Cain From Susan Cain Writer Added on 1/31/2026 About Susan Cain Susan Cain is an American writer and lecturer known for work on introversion, personality, and workplace culture. She is the author of Quiet: The Power of Introverts in a World That Cannot Stop Talking. Born: 1968-03-20 View all quotes from Susan Cain