It was a few years ago that I was sitting in Hebrew University and looking at micro films of old manuscripts of Rav Avraham Abulafia and I came across some positive statement about Yeshua [Jesus]. That was on the day before Hanuka. I kind of froze in my seat because I was not sure what to think of that. I knew that the Rashba [An important Rishon] did not hold of Rav Abulafia at all. But I also knew that the Remak (Rav M. Cordovaro) and Rav Haim Vital were quoting him as legitimate. Also the Chida brings him (Rav Haim David Azulai). It got to be the night of Hanuka and I decided to go with Rav Abulafia even though I knew that would send me on a trajectory that was far from what I had been doing until then.
Why did I decide that? because I figured the Rashba was more of an expert in his particular field of Gemara, while Rav Abulafia was more of an expert in his area.
[Besides that I had been learning the books of Rav Isaac Luria and Rav Nahman of Breslov already for a few years so I anyway had a kind of mental framework in which it is possible to understand the importance of true tzadikim. I also had been looking at the book of Rav Haim Vital in which the root souls of lots of different tzadikm is brought. That is the book where the Ari was explaining to Rav Haim Vital that the soul of Rav Haim Vital was from Emanation. [Most souls are from Creation]. So I already understood that there can be souls that stem from Emanation.]
I ought to mention that in the meantime someone from Mea Shearim came to Hebrew U. and put all the books of Rav Abulafia into readable script and printed them and you can even buy them in regular Hebrew.
Appendix
[1] Just for some background --the Rashba was a Rishon that had serious issues with Rav Abulafia. But even before I was looking at the manuscripts I was aware of the Rav Haim David Azulai who stood up for Rav Abulafia and that gave a lot of support in that direction. If the Rashba would be expressing an opinion about some passage in the Talmud, that would be more important. But in terms of his opinion about Rav Abulafia, that seems to me to be out of his range of expertise.]
[2] The idea of certain souls being from Emanation is brought down even before the Ari. However Rav Isaac Luria -the Ari- goes into a lot more detail than you can find anywhere else. So there is nothing particularly damming about saying a great tzadik has a soul that is from Emanation (i.e. Divine).