Drawing on a breadth of scientific knowledge and a deep understanding of the world's spiritual traditions, The Pineal Gland: The Eye of God is essential listening for anyone with an interest in the occult.

There slumber in every human being faculties by means of which he can acquire for himself a knowledge of higher worlds. Mystics, Gnostics, and Theosophists all speak of a world of soul and spirit which for them is just as real as the world we see with our physical eyes and touch with our physical hands.

The Kybalion is a book originally published in 1908 by "Three Initiates" (often identified as the New Thought pioneer William Walker Atkinson, 1862–1932) that purports to convey the teachings of Hermes Trismegistus. While it shares with ancient and medieval Hermetic texts a number of traits such as philosophical mentalism, the concept of 'as above, so below', and the idea that everything consists of gendered polar opposites, as a whole it is more indebted to the ideas of modern occultist authors, especially those of the New Thought movement to which Atkinson belonged.

The anthroposophy of Rudolf Steiner is not a theoretical system, but the results of research based on direct observation. As Steiner's research was so vast and conducted over such a long period of time, no single book can be said to contain the whole of his spiritual teaching. However, of all his books on occult science, also known as esoteric science, come closest. Steiner even referred to it as 'an epitome of anthroposophical spiritual science'. 

Originally published in 1894, Rudolf Steiner's Die Philosophie der Freiheit was considered by Steiner to be his most enduring work above all others. This is the first English translation, which was done in 1916. Two years later, in 1918, he revised it to be more in line with The Theosophical Society's philosophy. In many ways, this edition is truer to his spirit then all other translations, including some of the modern ones.