This is simply a small collection of Philosophical/Theosophical/spiritual books which I have found to be enlightening, and therefore highly recommend to anyone with an interest in spiritual growth. I presume that all of the listed works are in the public domain, though if any copyright holders beg to differ, please drop me a line and I will remove the work in question.
Emmanuel Swedenborg
Arcana Coelestia (Volume Three)
Arcana Coelestia (Volume Four)
Arcana Coelestia (Volume Five)
Arcana Coelestia (Volume Seven)
Arcana Coelestia (Volume Eight)
Arcana Coelestia (Volume Nine)
Arcana Coelestia (Volume Eleven)
Arcana Coelestia (Volume Twelve)
George Vale Owen
The Life Beyond the Veil (Volume One)
The Life Beyond the Veil (Volume Two)
The Life Beyond the Veil (Volume Three)
The Life Beyond the Veil (Volume Four)
C. S. Lewis
Manly P. Hall
The Secret Teachings of All Ages
Albert Pike
P. D. Ouspensky
Thomas Troward