Quotes from Otto Kroeger

As we've said many times before, Introverts get ulcers; Extroverts give ulcers.

With introverts, what you see is only a portion of their personality. The richest and most trusted parts of an introvert's personality are not necessarily shared with the outside world. It takes time, trust, and special circumstances for them to begin to open up.

It is this type more than any others whose style it is to stand by another person (or plant or animal), with no intention to influence it, criticize it, or change it-perhaps not even to interact with it-only to be in its presence.

Extraverted Feelers make fine salespeople who empathize with their customers, but so do Introverted Thinkers, who carefully listen to their customers without projecting their own needs.