The cure of an illness can result in a feeling of enthusiasm, the production of creative ideas, and a lasting personality change. This paper attempts to impress by leaping references, much in the style of Jung, going from German and French romanticists to Siberian shamans. The author finally comes to his main thesis: the creative work of Freud and Jung came as a result of their 'neurotic illness'. He omits the more ominous signs of Jung's illness, such as having kept a loaded revolver in his desk and being frightened by his homocidal-suicidal dreams soon after separating from Freud. There is very interesting documentation on the source of the term, the pleasure principle, which Freud admittedly borrowed from the philosopher, Fechner. Fechner had arrived at the concept after a serious depression had been replaced by hypomania. The paper ends in a continuation of the Freud-Jung controversy, in defense of Jung.