। ॥ ८८६ ॥
In plain words
This earth is not the ultimate reality, nor is water, nor fire, nor air, nor space, nor any of their creations. The pure, one, supreme truth that underlies them all—that very reality I am.
Close to the Sanskrit
This earth is not sat, nor water, nor fire, nor air, nor space, nor even the aggregate of its effects. That which is the pure underlying substratum of these, the one supreme truth, that alone I am.