According to a diversity of personality theories such as Carl Jung's Analytical Theory, for example, the human personality is made of a composite of the conscious mind, the unconscious mind, and the collective unconscious. This latter type of consciousness refers to a universal schema that all humans possess and by which we abide partly to make most of our daily choices.
Such choices include the things that motivate us into action, for example, embarking into new careers, or wanting to engage in a specific sport, study, etc. Since personality is created through our consistent interaction with the environment, understanding our reactions to different situations can help us also understand what we are capable (or willing) to do, or not do.
The Meyers-Briggs personality inventory is based on Jungian theory. Its primary goal is to determine which are the test-taker's personality traits so that they can be matched to a proper career. Those tested will answer questions based on personal preferences and choices. Hence, theoretically, some individuals are better suited to specific jobs than others just based on strengths, abilities, willingness, level of motivation, and, most specifically whether you are:
- Extraverted (E) versus Introverted (I)
- Sensing (S) versus Intuitive (N)
- Thinking (T) versus Feeling (F)
- Judging (J) versus Perceiving (P)
Therefore, someone who is introverted is not going to succeed in careers involving customer service or communication. Someone who is more of a "feeler" than a "thinker" cannot possibly conduct any type analysis objectively, hence, careers such as journalism, law, marketing, and psychology are out of the question. Concisely, knowing your personality traits gives you more opportunities to actually succeed at something that you might enjoy to do.