“That the kabbalists were not unaware of a possible connection between these ideas and the Christian Trinity is proved by the testimony of the Spanish scholar Profiat Duran. In his anti-Christian work “Ignominy of the Christians,” composed in 1397, he relates having heard in his youth many adepts of the Kabbalah voicing the opinion that the Christian dogmas of the Trinity and the Incarnation grew out of an erroneous interpretation of kabbalistic theses that were true in themselves.
Jesus and his disciples were not only great magicians—an opinion that was widespread in medieval Judaism—but real kabbalists, ”only their Kabbalah was full of mistakes.” The doctrine of the trinity, which they erroneously attributed to the deity, arose among them as a result of their missteps in this science [the Kabbalah] which established the primordial light, the radiant light and the transparent light.”
There was as well, already in the second half of the thirteenth century, no lack of philosophical opponents of the Kabbalah who, knowing nothing of this thesis of the three lights, nonetheless affirmed that the doctrine of the ten sefiroth was of Christian origin.
This thesis is, as our account of the true history of the idea of the sefiroth has shown, just as false as the historically unfounded suppositions of the kabbalists concerning the origins of the Christian dogmas. It is, incidentally, striking that the doctrine of Pseudo-Hai remained initially unknown to the first so-called “Christian kabbalists,” who only took it up after the middle of the sixteenth century and reinterpreted it in Christian terms for their own purposes.”
Gershom Scholem, Origins of the Kabbalah, p. 354.