According to Osho, a master is even more essential after satori because satori is only a fleeting glimpse of the peak; entering the unknown breeds doubt, fantasy, and spiritual intoxication. The master—who has realized the peak—holds your hand, tests experiences against truth, prevents self-deception, and guides the glimpse into stable, lived reality.
After your first peek of the mountaintop, you need an experienced guide to help you climb safely and not mistake mirages for the real thing.