The thoughts of the Greek philosophers attracted Jung, But his favorite was Schopenhauer, who dealt with suffering, confusion, passion and evil. Here at last, Jung thought, was a philosopher courageous enough to confess that not all fundaments of the universe are for the best. Schopenhauer depicted life as he saw it, and he did not camouflage the undesirable features of humanity. This philosophical message gave Jung a fresh perspective on life.
"The picture that Jung draws of himself during his youth is that of a solitary, bookish intellectual, puzzled by religious and philosophical questions and curious about the world. He was certainly no ordinary boy, just as he was to become no ordinary man. Yet many a boy of his temperament never develops into anything extraordinary. They often remain immature, become neurotic, or fritter away their lives in eccentricities."
A Primer of Jungian Psychology - C.S. Hall and V.J. Nordby