The prophet's own consciousness re-awakens. He no longer knows anything at all --- then grows the memory of the inspiration past; he asks if it is all. (It is evidently his own interpolation in the dictation.)
The phrase -- "the word" -- is of a deeper significance than at first sight may appear. The question is not merely equivalent to: "Is the dictation at an end?" For the Word is Conceived as the act of possession. This is evident from the choice of the word "exhausted". The inspiration has been like an electrical discharge. Language is in itself nothing; it is only the medium of transmitting experience to consciousness. Tahuti, Thoth, Hermes, or Mercury symbolize this relation; the character of this God is declared in very full terms in "The Paris Working", which should be studied eagerly by those who are fortunate enough to have access to the MS.