You cannot study Quantum Mechanics on Newtonian principles
There is no fundamental premise of modern psychology. Freud, Jung and Lacan all gave crippled models that collapsed before coming to stand on their feet. The truth is human experience CANNOT be studied empirically. Some kind of higher intuitive insight is required. People in this field of psychology and psychotherapy work mostly intuitively. The blind faith in empiricism has reached its limits. The time to come is one of intuition. The Enneagram will emancipate the study of psychology from the rather useless empirical scientific ways.