@Nudor said
"Was this A.C. diary ever published?"
No, but part of it is reproduced in Magick in Theory & Practice:
*"All elements must at one time have been separate.--That would be the case with great heat.--Now, when the atoms get to the Sun, we get that immense, extreme heat, and all the elements are themselves again. Imagine that each atom of each element possesses the memory of all his adventures in combination. By the way, that atom, fortified with memory, would not be the same atom; yet it is, because it has gained nothing from anywhere except this memory. Therefore, by the lapse of time and by virtue of memory, a thing could become something more than itself; thus, a real development is possible. One can then see a reason for any element deciding to go through this series of incarnations, because so, and only so, can he go; and he suffers the lapse of memory which he has during these incarnations, because he knows he will come through unchanged.
"Therefore you can have an infinite number of gods, individual and equal though diverse, each one supreme and utterly indestructible. This is also the only explanation of how a Being could create a world in which War, Evil, etc., exist. Evil is only an appearance, because (like "Good") it cannot affect the substance itself, but only multiply its combinations. This is something the same as Mystic Monotheism; but the objection to that theory is that God has to create things which are all parts of Himself, so that their interplay is false. If we presuppose many elements, their interplay is natural.""*