Ni-INFJ. His writing reflects both strong introverted intuition and presence of introverted logic. On
socionics forums most people typed him as LII, IEI, and ILI which corresponds to INTP, INFJ, and INTJ in MBTI. The 4th most popular typing is ISTP (LSI) but very few people are in this camp and even watching his interviews he seems to spacey for an Extroverted Sensor.
Some of his quotes sound rather Fe and dejecting of Te. Here, he is basically saying "you want to know people? go out and travel and socialize! you won't learn anything from careful scientific experimentation" - this is not very INTJ if you ask me.
"... Anyone who wants to know the human psyche will learn next to nothing from experimental psychology. He would be better advised to abandon exact science, put away his scholar's gown, bid farewell to his study, and wander with human heart throught the world. There in the horrors of prisons, lunatic asylums and hospitals, in drab suburban pubs, in brothels and gambling-hells, in the salons of the elegant, the Stock Exchanges, socialist meetings, churches, revivalist gatherings and ecstatic sects, through love and hate, through the experience of passion in every form in his own body, he would reap richer stores of knowledge than text-books a foot thick could give him, and he will know how to doctor the sick with a real knowledge of the human soul." ― Carl Jung
and what kind of INTx would say that he purposefully dramatizes his writing? this sounds like Fe was one of this strong valued functions (another famous historical figure who gave preference to dramatic mythologized way of speaking was Hitler, typed as INFJ in MBTI and ENFj in socionics)