Egyptian Magic in Egyptian Magic by Florence Farr.

“Now, if an Egyptian failed in standing such tests as these, in the ceremony of his initiation, he was regarded as a man liable to become an evil KHOU if his power was developed: and in their Wisdom the Priests rejected him and left him in that ignorance which led to oblivion and the annihilation of the incarnating Ego. Not only this, but if he, by underhand means, found out magical formulas and was able to use them effectively, the punishment was death.” [via]