Solitude mater. And for some people, it is the air breathe. Susan Cain, author of Quiet: The Power of Introverts in a World That Can't Stop Talking, firmly believes this to be true. she also believes that Introverts struggle in our society because of the deep bias against them. she says that "our most important institutions, our schools and workplaces, they are designed mostly for extroversts, and for extroversts' need for lost of stimulation.