Archer also maintained that the prophet Isaiah wrote the entire book of Isaiah; he wrote regarding this issue: "There is not a shred of internal evidence to support the theory of a Second Isaiah, apart from a philosophical prejudice against the possibility of predictive prophecy."
Archer juga menyatakan bahwa nabi Yesaya menulis seluruh kitab Yesaya, ia menulis mengenai masalah ini: "tidak ada bukti internal sedikitpun yang mendukung teori Yesaya Kedua, terlepas dari prasangka filosofis terhadap nubuat prediktif."