Egyptian Magic in Egyptian Magic by Florence Farr.

“He says further:

‘And when the soul has received Him as her leader the Daimon immediately presides over the soul, gives completion to its lives, and binds it to body when it descends. He likewise governs the common animal of the soul (the SAHU) and directs its peculiar life, and imparts to us the principles of all out thought and reasonings.” [via]