Most of what I know about the Cathars comes from the writings of Arthur Guirdham, a psychiatrist who claimed to remember many past lives including a Cathar one. This involved a sort of group reincarnation and many strange synchronicities:
https://en.wikipedia.org/wiki/Arthur_Guirdham
https://www.amazon.co.uk/Arthur-Guir...273&sr=1-2-ent
Patrick
