After watching the extraordinarily well done full-length video done by PBS on his life, he is without a doubt:
*very logical; detached emotions from his logic (although he had strong emotions) (xNTx)
*most strongly motivated by the need to achieve; be seen as a genius (xNTx)
*a devoted romantic (they showed some of his love letters to his wife when they were courting) but he ended up spending more time on his work than his relationships (xNTx)
*driven to apply his ideas to reality (xNTJ); i.e. it was not enough to fully understand, he HAD to apply it
*he revolutionized the way people approached "hysteria" and laid the foundations for a wave of understanding psychological patterns (abuse, somatoform disorders, conversion disorders, mood disorders, etc.) xNxx.
He seemed more introverted to me, however, he is without a doubt an xNTJ.
*You don't have a soul. You are a Soul. You have a body.
*Faith is the art of holding on to things your reason once accepted, despite your changing moods.