the ego standing between them, as between hammer and anvil. But over against this ego, tossed like a shuttlecock between the outer and inner demands, there stands some scarcely definable arbiter
Jung posits the ego as structurally positioned between hammer and anvil — outer collective demands and inner unconscious forces — a condition that necessitates recourse to a ‘scarcely definable arbiter’ beyond ordinary conscience.
, Two Essays on Analytical Psychology, 1953thesis