It began in what seemed in my personal
narratizations as an individual choice of a problem with which I
have had an intense involvement for most of my life: the problem of the nature and origin of all this invisible country of
touchless rememberings and unshowable reveries, this introcosm
that is more myself than anything I can find in any mirror. But
was this impulse to discover the source of consciousness what it appeared to me? The very notion of truth is a culturally given
direction, a part of the pervasive nostalgia for an earlier certainty. The very idea of a universal stability, an eternal firmness
of principle out there that can be sought for through the world as
might an Arthurian knight for the Grail, is, in the morphology of
history, a direct outgrowth of the search for lost gods in the first
two millennia after the decline of the bicameral mind. What was
then an augury for direction of action among the ruins of an archaic mentality is now the search for an innocence of certainty
among the mythologies of facts.

https://ia802907.us.archive.org/32/items/The_Origin_Of_Consciousness_In_The_Breakdown_Of_The_Bicameral_Mind_Julian_Jaynes_1976.pdf

https://youtu.be/W0vTZrZny6A?si=W1BLflHOkHPddhRM