For it evidently contains both pre-exilic and exilic elements.
Her exilic judgment is pictured in the next verse: "And now she is planted in the wilderness, in a dry and thirsty land."
It will perhaps startle some to hear John Calvin quoted on behalf of the exilic date of these prophecies.
It is in commenting on a verse of these chapters that Calvin makes the admission of exilic origin which has been quoted above.
In this there is nothing to make the Isaian authorship probable, or an exilic date impossible.
The key must be sought in the exilic and post-exilic age where, unfortunately, direct and decisive evidence is lacking.