Secret Notes of a Guru (1952) was written by Samael Aun Weor while he was in prison. The official document stated the reason for his arrest:

“This man, in addition to committing the crime of healing the ill, is also the author of a book entitled The Perfect Matrimony, which is an outrage against public morality and the good customs of the citizens.”

This book has not yet been published, but it can be if you help: make a donation.