“Only in the messianic era will the position of Sammael be restored; the Throne of God, which for the present is damaged, will then be repaired.
It thus appears that Isaac the Blind was a follower of the doctrine of the ultimate “restoration of Satan,” the apocatastasis.
Since, as is well known, Judaism recognized no official dogmatic authority that was entitled to determine the content of the faith, this question too, which played such an important role in the history of the Christian churches, remained open and a subject of dispassionate discussion.
Opinions were divided, and many mystics adhered to the “restoration” doctrine. Later kabbalistic theories exhibiting the same tendency, such as Joseph ibn Gikatilla’s Mystery of the Serpent, probably owe their inspiration to Isaac the Blind.
What is curious in the case of Isaac is that Sammael did not fall from his exalted rank, as one would expect, at the time of Adam’s sin—for which the Aggadah holds him responsible—but only at the time of the battle against Amaleq.
In this detail he was not followed by later kabbalists; even when they defended the doctrine of apocatastasis they placed it in relation to the reestablishment of the harmony of all things, which had been disturbed by Adam’s original sin.
However, also for ibn Gikatilla (as for Isaac), the serpent drew his original power directly from the sacred domain of the emanations, standing outside its “walls” and acting as the genius of the entire sublunar world. There, too, the rebellion of the serpent introduces disorder into the harmonious union of the worlds and isolates Sammael as genius of evil.
Isaac’s view that the supreme angelic powers draw their influx directly from the tenth sefirah is also found in Ezra, who attests to having received “from the lips of the son of the master,” that is, from Isaac the Blind, the doctrine “that Metatron is only a messenger, and not a specific thing bearing that name.
Rather, every messenger is called in Greek metator, and perhaps the messengers received the influx of the [tenth sefirah] named ‘atarah to fulfill their mission.”
Metatron is therefore not a proper name at all but a designation for the whole category of celestial powers performing a mission. This conception is far more prosaic than that taught by his father, the Rabad (cf. the passage quoted, p. 212), in his commentary on the Talmud.
Is this the whole truth about Isaac’s view, or merely an occasional remark? No other kabbalist ever denied the existence of a specific angelic being called Metatron, even if he adopted Isaac’s etymology.
The etymology itself is apparently taken from the old talmudic dictionary ‘Arukh of Nathan ben Yehiel of Rome, which was well known in Provence (as metator). Isaac obviously did not think of identifying Metatron with the last sefirah, the Shekhinah, although the identification is found later, among the first generation of Catalan kabbalists.”
Gershom Scholem, Origins of the Kabbalah, pp. 298-9.