। ॥ ५१ ॥
In plain words
How could impurity exist in what is utterly pure? Everything seen is therefore made of Māyā. Silver seen in mother-of-pearl is not truly there; just so, the universe in the supreme Ātman is unreal.
Close to the Sanskrit
In the pure, how could the impure be? Therefore the seen is made of māyā. Just as silver in mother-of-pearl is unreal, so too is the universe in the supreme Self.