Edouard Schuré 
The Wisdom of Pythagoras [EPUB ebook] 

The secrets of the master's order and thought are now, like the ruins of the ancient town, buried deep underground. All the same we will try to resurrect them, for thus we shall have an opportunity of penetrating to the very heart of the theosophic doctrine, the arcanum of religions and philosophies, and raising a corner of the veil of Isis to the light of Greek genius.