One of the most important of Jung's longer works, and probably the most famous of his books, Psychological Types appeared in German in 1921 after a "fallow period" of eight years during which Jung had published little. He called it "the fruit of nearly twenty years' work in the domain of practical psychology," and in his autobiography he wrote: "This work sprang originally from my need to define the ways in which my outlook differed from Freud's and Adler's. In attempting to answer this question, I came across the problem of types; for it is one's psychological type which from the...

Jung's last major work, completed in his 81st year, on the synthesis of the opposites in alchemy and psychology.

Aion is one of a number of major works that Jung wrote during his seventies that were concerned with the relations between psychology, alchemy and religion.

He is particularly concerned in this volume with the rise of Christianity and with the figure of Christ. He explores how Christianity came about when it did, the importance of the figure of Christ and the identification of the figure of Christ with the archetype of the Self. A matter of special importance to Jung in his seventies - the problem of opposites, particularly good and evil - is further discussed and the...