Introversion — along with its cousins sensitivity, seriousness, and shyness — is now a second- class personality trait, somewhere between a disappointment and a pathology. Introverts living under the Extrovert Ideal are like women in a man’s world, discounted because of a trait that goes to the core of who they are. Extroversion is an enormously appealing personality style, but we’ve turned it into an oppressive standard to which most of us feel we must conform.
— Susan Cain, Quiet: The Power of Introverts in a World That Can’t Stop Talking
One thing is certain: there are as many nights as days, and the one is just as long as the other in the year’s course. Even a happy life cannot be without a measure of darkness, and the word “happy” would lose its meaning if it were not balanced by sadness.