According to Osho, humanity forgot its Buddha nature not in a distant past but whenever authority, prohibition, and borrowed knowledge seduced the mind into imagination. Like Adam and Eve, being told don't created obsession, conditioning, and second-hand truths. This veiled our innate clarity; only direct seeing - your own knowing - restores the original, unconditioned awareness.
We lost our natural innocence when we followed rules and ideas instead of directly seeing for ourselves.