G. R. S. Mead 
The Corpus Hermeticum [EPUB ebook] 

This is the extended and annotated edition including
* an extensive annotation of almost 10.000 words about the history and basics of Gnosticism, written by Wilhelm Bousset
The so-called Hermetic writings have been known to Christian writers for many centuries. The early church Fathers (Justin Martyr, Tertullian, Clement of Alexandria) quote them in defense of Christianity. Stobaeus collected fragments of them. The Humanists knew and valued them. They were studied in the sixteenth and seventeenth centuries, and in modern times have again been diligently examined by many scholars.
Contents:
I. Poemandres, the Shepherd of Men
II. To Asclepius
III. The Sacred Sermon
IV. The Cup or Monad
V. Though Unmanifest God Is Most Manifest
VI. In God Alone Is Good And Elsewhere Nowhere
VII. The Greatest Ill Among Men is Ignorance of God
VIII. That No One of Existing Things doth Perish, but Men in Error Speak of Their Changes as Destructions and as Deaths
IX. On Thought and Sense
X. The Key
XI. Mind Unto Hermes
XII. About The Common Mind
XIII. The Secret Sermon on the Mountain