Kabbala can increase sexual lust even amongst talmidei chochomim - Rav Tzadok

 Rav Tzadok (Shaar HaYichud): And thus I have seen written in a book which was written by a holy man and he said that the sect of Shabtsai Tzvi which did that which it did  - because they were involved in the study of Kabbala when their hearts were full of the lusts of this world. Consequentially they took literally the metaphors of kabbala. Thus when they saw in the Kabbala literature terms such as sexual relations, hugging, kissing and others similar expressions it aroused in them lusts and adultery until they became very wicked people. And similarly I am aware of one Rav from the previous generation who was considered to be a scholar and kabbalist and he printed a book on kabbalistic matters with the haskomos of the gedolim of that generation. And afterwards he sinned by committing adultery. There is no question that this was caused by his involvement in kabbala and his taking literally the metaphors of kabbala as is clear from what he wrote in his book. I am writing this in order that people are warned how carefully they must be when studying esoteric material as our Rabbis have said.