Introverted feeling types have a wealth of warmth and enthusiasm, but they may not show it until they know someone well. They wear their warm side inside, like a fur-lined coat.

The visions of the INFJs tend to concern human welfare, and their contributions are likely to be made independent of a mass movement.

... much seemingly chance variation in human behavior is not due to chance; it is in fact the logical result of a few basic, observable differences in mental functioning.

[On Jung's theory of psychological types:] My mother, Katharine C. Briggs, introduced it into our family and made it a part of our lives. She and I waited a long time for someone to devise an instrument that would reflect not only one's preference for extraversion or introversion but one's preferred kind of perception and judgment as well. In the summer of 1942 we undertook to do it ourselves.

Whatever the circumstances of your life, the understanding of type can make your perceptions clearer, your judgements sounder, and your life closer to your heart's desire

Extraverts ... cannot understand life until they have lived it. Introverts ... cannot live life until they understand it.

Although intelligence tests are usually speed tests for the sake of convenience, it is debatable whether speed has any rightful place in the basic concept of intelligence.