। ॥ ३९३ ॥
In plain words
By saying it again and again — 'there is nothing else here' — the scripture is making a point of declaring that duality has no reality at all, so that the false thing you've laid on top of it can finally be lifted off.
Close to the Sanskrit
Through repeated emphatic statement, saying 'there is nothing else here', the scripture declares freedom from duality, for the removal of false superimposition.