According to Osho, no separation ever occurred; the ‘imperishable part’ never left the Source. Separation is only a dream born of ego and forgetfulness, sustained by identification with body and mind. Asking when/why/how is futile; the remedy is awakening. Through alert witnessing and dropping borrowed beliefs, remembrance returns, identification loosens, and the illusory gap vanishes—revealing you have always been the Whole.
Like dreaming you’re a horse, you never truly changed—just wake up and remember your real nature.