Theurgia, or The Egyptian Mysteries (includes Letter to Anebo)

Why, then, are so many things performed for them in the sacred rites, as if they were impressionable beings? The invocations are made as to gods who are impressionable; this implies that not only the spirits, but the gods themselves, are impressionable, just as Homer declared:

Suppose, then, we say, as some have affirmed, that the gods are pure mental essences and that the spirits are psychic beings participating in mind. Xenocrates, a disciple of Plato, taught that the heavens were divine and that the divine nature was pure, absolute mind. He described the stars as "visible divinities." He depicted spirits as having a psychic nature, subordinate to the gods and therefore subject to emotion, while sharing in the intelligence of the gods. The fact remains, however, that pure mental essences cannot be charmed or mingled with sensible things, and the supplications offered are entirely foreign to such pure mental substance. On the other hand, the offerings are presented as if to sensitive and psychic natures.