I found a reference to
Natura naturans in Waite's 1902 book,
The Doctrine and Literature of the Kabalah. It's used in connection to a description of the third triad of the Tree of Life (Netzach, Hod and Yesod).
"The third triad is dynamic; its
Sephiroth signify the Deity as universal potentiality, energy and productive principle. They answer to the idea of Nature, the
natura naturans, however, and not the
natura naturata."
According to
Wikipedia,
natura naturans represents nature as an active dynamic principle while
natura naturata is static, or nature already created. I'm assuming
natura naturata would describe Malkuth.
Waite applies
natura naturans to one aspect or principle of Deity so it seems presumtuous and out of place for deLaurence to use God and Nature virtually as interchangeable. I've never seen "God (Nature)" in any of Waite's books or papers so Moakley's comment seems uninformed. She may well have been going by the deLaurence book.
This was the only reference to
natura naturans I could find in the books I have; there may be more. Spinoza is also mentioned once in the Kabalah book I referenced.
If you could find a copy online that would be awesome. I've looked but so far nothing. I found a first edition PKT in pretty rough shape for US $95. I can only imagine what an original
Key would go for.