There are two sides to personality, one of which is temperament and the other character. Temperament is a configuration of inclinations, while character is a configuration of habits.
Character is disposition, temperament pre-disposition.
Put another way, our brain is a sort of computer which has temperament for its hardware and character for its software. The hardware is the physical base from which character emerges, placing an identifiable fingerprint on each individual's attitudes and actions. Thus, the SP s base their self-image on graceful action, bold spirit, and adaptability to circumstance, these three traits evolving together of necessity. In the same way, the SJ s base their self-image on reliability, service, and respectability, these three traits emerging together as a unified structure of personality. And again, the unfolding of these three traits together weighs against developing a self-image based on ingenuity, autonomy, and willpower, which is characteristic of the NT s.