The meeting of two personalities is like the contact of two chemical substances; if there is any reaction, both are transformed.
– Carl Jung
If introverts and extroverts are the north and south of temperament–opposite ends of a single spectrum–then how can they possibly get along? Yet the two types are often drawn to each other–in friendship, business, and especially romance. These pairs can enjoy great excitement and mutual admiration, a sense that each completes the other.
– Quiet by Susan Cain, (The Communication Gap, chapter 10)