“Loneliness does not come from having no people about one, but from being unable to communicate the things that seem important to oneself, or from holding certain views which others find inadmissible.”
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C.G. Jung 257
Swiss psychiatrist and psychotherapist who founded analytic… 1875–1961Related quotes

The Human Comedy (1943)
Context: Everything is changed — for you. But it is still the same, too. The loneliness you feel has come to you because you are no longer a child. But the whole world has always been full of that loneliness. The loneliness does not come from the War. The War did not make it. It was the loneliness that made the War.

Inside Information p. 7
The Book on the Taboo Against Knowing Who You Are (1966)
“The worst thing about loneliness is that it brings one face to face with oneself.”
Source: No Man's Mistress

as quoted by Andre Khalil in "As Above, So Below," Lynn Margulis: The Life and Legacy of a Scientific Rebel ed. Dorion Sagan (2012).
“One does not meet oneself until one catches the reflection from an eye other than human.”

Source: The systems view of the world (1996), p. 11.

Nobel Prize autobiography (1998)
Context: Real understanding of a thing comes from taking it apart oneself, not reading about it in a book or hearing about it in a classroom. To this day I always insist on working out a problem from the beginning without reading up on it first, a habit that sometimes gets me into trouble but just as often helps me see things my predecessors have missed.

“Originality is being different from oneself, not others.”
Source: Philip Larkin: Letters to Monica