“What matters here is the fact that this doctrine is taught as a mystery, accessible to initiates only, yet at the same time the author also takes it so much for granted that he does not consider it as requiring a special justification. The Cathars too taught it as a secret, which is not surprising since the Church had formally and dogmatically condemned this doctrine, and anyone adhering to it was automatically considered a heretic.
The details of this doctrine as taught by the Cathars are very different. Thus the Bahir does not know the idea of a migration into animal bodies or into any but human forms of existence. The doctrine of the transmigration of souls appeared as an answer to the question of theodicy:
“Why do things go well for an evildoer and badly for a righteous man? Because the righteous man was already [once] in the past an evildoer and he is now being punished. But does one punish a person for [wrongs committed in] the days of his youth? … I do not speak of the [same] life; I speak of the fact that he was already there in the past. His companions said to him: How long will you still speak obscure words?”
In response, R. Rahmai expounds to them, Isaiah 5:2, the parable of the owner of the vineyard who repeatedly replanted and pruned because the grapes were not growing well.
“How often? He said: until the thousandth generations, for it is written [Ps. 105:8]: “The promise He gave for a thousand generations.” And that is the meaning of the dictum [in Hagigah 13b]: 974 generations were wanting; then God arose and implanted them in every generation.” (section 135)
The objections here show that the questioners were completely ignorant of the esoteric doctrine to which the apocryphal R. Rahmai refers. His statements are incomprehensible to them. The notion is taught not in a coherent theoretical exposition but, as is also the case in other passages of the Bahir relating to this doctrine, in the form of parables.
The parable makes express mention of only three unsuccessful attempts to improve the vineyard. It is not clear whether this is already an allusion to the later idea of a triple transmigration. The talmudic passage that is interpreted here in the sense of the transmigration of souls knows nothing of it either.”
Gershom Scholem, Origins of the Kabbalah, pp. 188-9.