अध्यस्तो रज्जुसर्पोऽयं सत्यवद्रज्जुसत्तया ।तथा जगदिदं भाति सत्यवत्स्वात्मसत्तया ॥ ६८ ॥
In plain words
The snake in the rope is laid over it, and it looks real on the strength of the rope's own being. This world appears in exactly the same way — looking real on the strength of the being of your own Self.
Close to the Sanskrit
This rope-snake is superimposed, appearing as if real by the existence of the rope; likewise this world shines, appearing as if real by the existence of one's own Self.