in the cauldron things are cooked together, and out of things strange to each other, irreconcilable, something new comes forth. This is obviously the answer to the paradox, the impossible impasse.
Jung identifies the cauldron as the psyche’s own solution to the impossible paradox, the archetypal vessel in which irreconcilable opposites are held until genuine novelty emerges.
, Dream Analysis: Notes of the Seminar Given in 1928-1930, 1984thesis