By Carl Jung

Carl Jung’s Psychological Types, part of his Collected Works, remains one of the most influential contributions to psychology, particularly in understanding human consciousness and personality. Published in 1921, this book established foundational ideas about personality and cognitive functioning, introducing terms like introversion, extraversion, and the now-famous cognitive functions. These concepts underpin many modern psychological theories and assessments, including the Myers-Briggs Type Indicator (MBTI).

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