An early belief of some philosophers of Ancient Greece was that the mind was like a recording device and simply kept somehow-objective records of what the senses experienced. This was believed in the Western world into the 20th century untilcognitive psychology experiments decisively proved that it was not true, and that many events were simply filled in by the mind, based on what "should be". This among other things explained why eyewitness accounts of events often were so widely varied.
In Ancient Rome it was believed that personal experience was part of some divine or species-wide collective experience. This gave rise to notions of racial memory, national mission, and such notions as racism and patriotism. It was likely easier to create political movements and military morale with such notions, than a strictly personal idea of experience. Carl Jung and Joseph Campbell were notable investigators of these ideas of collective experience in the 20th century.
During The Enlightenment, there was rigorous investigation of these ideas. Imman uel Kant noted that it was only possible to explain "experience and its objects" as a consequence of each other: either experience makes those objects possible, or those objects make experience possible. This is seen today as daulism, and denying the possibility of a third thing making both experience and whatever reality its objects have, both possible. That thing could be a more universal cognition, as proposed in some versions of Christianity or Gaia philosophy.
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We believe personal experience is such a valuable thing to keep in our minds
They are much worth than we think!!
