Think of the spiritual paths and organizations you once belonged to. Sometimes, you got lucky and you fit right in with the rest of the group. But, in many cases, you didn't.
You tried to fit in. Your forced yourself like a square peg in a round hole, but the more you used will power, the more inauthentic you felt.
Falsification of type is the gateway to all sorts of illnesses. When one is living inauthentically, it takes more oxygen, energy and more psychic resources to maintain that false persona.
Depression, confusion, anger, frustration, etc. are all byproducts of a life lived in such a manner.
Dr. Katherine Benziger discusses this phenomenon in detail on her website: http://www.benziger.org/
**** NOTE: It is possible to get a false result on the Keirsey Temperament Sorter, especially if you've adapted to an environment which is very different from your temperament. For example, SRF embraces the Guardian ethos. If you are an Idealist and you become very involved with SRF, you will eventually exhibit characteristics of a Guardian. If you are an Extravert and you join a monastic order, which is primarily an introverted vocation, you will become an Introvert. This maladaptation can happen anywhere: families, work environments, political environments, etc. According to researchers, the brain requires 100 times more oxygen and energy when forced to operate outside of its natural preferences. When one sustains this kind of stress over a long period of time, it becomes what is known as Prolonged Adaptative Stress Syndrome (PASS). This is the gateway to all sorts of illnesses and neurotic symptoms. Hence, it makes sense to understand one's temperament and choose a vocation, an environment, and one's associations wisely.