In expounding his system of personality types Jung relied not so much on formal case data as on the countless impressions and experiences derived from the treatment of nervous illnesses, from intercourse with people of all social levels, "friend and foe alike," and from an analysis of his own psychological nature. The book is rich in material drawn from literature, aesthetics, religion, and philosophy. The extended chapters that give general descriptions of the types and definitions of Jung's principal psychological concepts are key documents in analytical psychology

"The concept of synchronicity indicates a meaningful coincidence of two or more events, where something other than the probability of chance is involved. Chance is a statistical concept which 'explains' deviations within certain patterns of probability. Synchronicity elucidates meaningful arrangements and coincidence which somehow go beyond the calculations of probability. Pre-cognition, clairvoyance, telepathy, etc. are phenomena which are inexplicable through chance, but become empirically intelligible through the employment of the principle of synchronicity, which suggests a kind of harmony at work in the interrelation of both psychic and physical events."
�The Journal of Religious Thought

Twilight of the Idols, 'a grand declaration of war' on all the prevalent ideas of his time, offers a lightning tour of his whole philosophy. It also prepares the way for The Anti-Christ, a final assault on institutional Christianity. Yet although Nietzsche makes a compelling case for the 'Dionysian' artist and celebrates magnificently two of his great heroes, Goethe and Cesare Borgia, he also gives a moving, almost ecstatic portrait of his only worthy opponent: Christ. Both works show Nietsche lashing out at self-deception, astounded at how often morality is based on vengefulness and resentment. Both combine utterly unfair attacks on individuals with amazingly acute surveys of the whole contemporary cultural scene. Both reveal a profound understanding of human mean-spiritedness which still cannot destroy the underlying optimism of Nietzsche, the supreme affirmer among the great philosophers.