I am surely an INFJ (Introverted Intuitive Feeling Judging) one of the types described in the Myers-Briggs Type Indicator (MBTI) system. What is an INFJ?

Beneath the quiet exterior, INFJs hold deep convictions about the weightier matters of life. Those who are activists — INFJs gravitate toward such a role — are there for the cause, not for personal glory or political power. INFJs are champions of the oppressed and downtrodden. They often are found in the wake of an emergency, rescuing those who are in acute distress. INFJs may fantasize about getting revenge on those who victimize the defenseless. The concept of ‘poetic justice’ is appealing to the INFJ. “There’s something rotten in Denmark.” Accurately suspicious about others’ motives, INFJs are not easily led. These are the people that you can rarely fool any of the time. Though affable and sympathetic to most, INFJs are selective about their friends. Such a friendship is a symbiotic bond that transcends mere words. INFJs have a knack for fluency in language and facility in communication. In addition, nonverbal sensitivity enables the INFJ to know and be known by others intimately. from http://typelogic.com/infj.html

An INFJ type is also called a Counselor Idealists.

The Counselor Idealists are abstract in thought and speech, cooperative in reaching their goals, and enterprising and attentive in their interpersonal roles. Counselors focus on human potentials, think in terms of ethical values, and come easily to decisions. The small number of this type (little more than 2 percent) is regrettable, since Counselors have an unusually strong desire to contribute to the welfare of others and genuinely enjoy helping their companions. Although Counsleors tend to be private, sensitive people, and are not generally visible leaders, they nevertheless work quite intensely with those close to them, quietly exerting their influence behind the scenes with their families, friends, and colleagues. This type has great depth of personality; they are themselves complicated, and can understand and deal with complex issues and people. Counselors can be hard to get to know. They have an unusually rich inner life, but they are reserved and tend not to share their reactions except with those they trust. With their loved ones, certainly, Counselors are not reluctant to express their feelings, their face lighting up with the positive emotions, but darkening like a thunderhead with the negative. Indeed, because of their strong ability to take into themselves the feelings of others, Counselors can be hurt rather easily by those around them, which, perhaps, is one reason why they tend to be private people, mutely withdrawing from human contact. At the same time, friends who have known a Counselor for years may find sides emerging which come as a surprise. Not that they are inconsistent; Counselors value their integrity a great deal, but they have intricately woven, mysterious personalities which sometimes puzzle even them. Counselors have strong empathic abilities and can become aware of another’s emotions or intentions — good or evil — even before that person is conscious of them. This “mind-reading” can take the form of feeling the hidden distress or illnesses of others to an extent which is difficult for other types to comprehend. Even Counselors can seldom tell how they came to penetrate others’ feelings so keenly. from http://keirsey.com/handler.aspx?s=keirsey&f=fourtemps&tab=3&c=counselor

Famous people with an INFJ type: John Bradshaw, Mother Teresa, Nelson Mandela, John Calvin, Nicole Kidman.