The writings and the recommendations of the earliest medical scientists and the new breed of clinicians between the mid-fifteenth and early seventeenth centuries were based on the supposition that sufficient study and experimentation would elucidate not only the origins of disease, but its treatment as well.

There were some great clinicians in the 20th century - great men. Freud was a genius; Jung was a genius, Carl Rogers was a genius - there's a half-dozen psychologists of the 1950s and humanists of the 1960s.