INFJ (1-3% of the population)
For INFJs the dominant quality in their lives is their attention to the inner world of possibilities, ideas, and symbols. Knowing by way of insight is paramount for them, and they often manifest a deep concern for people and relationships as well. INFJs often have deep interests in creative expressions as well as issues of spirituality and human development. While their energy and attention are naturally drawn to the inner world of ideas and insights, what people often first encounter with INFJs is their drive for closure and for the application of their ideas to people’s concerns.
ENFJ (2-5% of the population)
For ENFJs the dominant quality in their lives is an active and intense caring about people and a strong desire to bring harmony into their relationships. ENFJs are openly expressive and empathetic people who bring an aura of warmth to all that they do. Intuition orients their feeling to the new and to the possible, thus they often enjoy working to manifest a humanitarian vision, or helping others develop their potential. ENFJs naturally and conscientiously move into action to care for others, to organize the world around them, and to get things done.
From Looking at Type: The Fundamentals - Charles Martin, Ph.D.