The meeting of two personalities is like the contact of two chemical substances: if there is any reaction, both are transformed.
Die Begegnung zweier Persönlichkeiten ist wie der Kontakt zweier chemischer Substanzen: Wenn überhaupt eine Reaktion erfolgt, sind beide verwandelt.

Psychologists
Carl Jung
Swiss psychiatrist (1875-1961), founder of analytical psychology. Coined the collective unconscious, archetypes, introvert / extravert typology and synchronicity. His Nazi-era chairmanship remains contested.
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Carl Jung's Other Quotes
Whoever looks into the mirror of the water will see first of all his own face. Whoever goes to himself risks a confrontation with himself.
Until you make the unconscious conscious, it will direct your life and you will call it fate.
Life is — or has — both meaning and meaninglessness. I cherish the anxious hope that meaning will preponderate and win the battle.