Jung regarded the unconscious and its symbolic content as crucial to our psychological development; among the central concepts of analytical psychology is individuation, which is the lifelong psychological process of differentiation of the self. Jung considered it to be the main task looming over every human being in their development, and experimented with a variety of practices to dive always deeper into it. These 100 quotes have been carefully selected to introduce you to his character and his way of thinking, and to inspire you into making your own discoveries about the unconscious.

Lao Tsu, also known as Lao Tzu or Laozi, is an ancient Chinese philosopher and sage, and an absolutely central figure in Asiatic culture. He is known as the author of the "Tao Te Ching" or "Daodejing" and the founder of Taoism. In traditional China, Taoism is a way of living in harmony with the Tao, "way", "path", or "principle", something that is both the source of, and the force behind, everything that exists. Throughout history, Laozi's work has been embraced by various anti-authoritarian movements, because his style is designed to elicit critical thinking through ambiguousness.

Socrates is an enigmatic figure, known chiefly through the accounts of others like Plato and Aristophanes. He was one of the most brilliant intellects ever, and devised what would later be called the Socratic method, which is a way of leading one's interlocutor to see his errors and contradictions through clever questioning before leading him to the truth. In ancient Athens, Socrates was widely known as a "gadfly", that is, an annoying insect buzzing at people's ears, because he kept questioning prejudices and contradictions; he was eventually tried and executed for "corrupting the minds of the youth".

Marcus Aurelius was a Roman Emperor, the last of the Five Good Emperors, and one of the most important Stoic philosophers, along with the slave Epictetus. Marcus Aurelius wrote the Meditations while in a military campaign; it was a series of notes written for no one but himself in his quest for self-improvement. Stoicism is the attitude allowing one to free oneself from the unnecessary suffering that arises from anxiety about events that are beyond our control; therefore, it can be of tremendous importance in one's life.

Gautama Buddha is also known as Siddharta Gautama, or simply the Buddha, which means "Awakened" or "Enlightened". Born a prince, he chose a path of ascetism only to realize that it was as profound an illusion as self-indulgence. He achieved Enlightenment after 49 days of meditation; his awakening led him to discover the cause of suffering and the ways to eliminate it. These discoveries founded Buddhism, and his "Four Noble Truths" still form the heart of its teachings.