। ॥ ७३१ ॥
In plain words
If the manifold world and the individual soul were ultimately real, how could Brahman be truly non-dual? Therefore, scripture teaches their undivided oneness as an indivisible whole.
Close to the Sanskrit
While the world-expansion or the individual soul exists, whence is the non-duality of Brahman? Therefore the undivided oneness of those two is accepted by scripture.