According to Osho, there is no real separation from the divine; only a dream of separation born of ego and identification. The part can never break from the Whole. You have merely forgotten. Reunion is not a future event but awakening—remembering your original nature through awareness. Drop scholarly ‘when/why/how’ and recognize: you already are That.
It’s like dreaming you’re someone else—just wake up and remember you were always one with the divine.