From the beginning of the world, there have been mystical societies and initiatory orders that have acted invisibly, promoting the Divine Work on earth. The Rosicrucians "Brothers of the East", the Theurgic Knights "Chosen Kohens", and the contemporary Martinists are different landmarks in the same spiritual current that constitutes European Esotericism. In this book, after the first part that introduces us to the living European mystical tradition, the reader will find a whole anthology of texts from the sixteenth century to the present day. Mystics of the Spirit such as Henri Corbin, Jacob Boehme, and Louis Claude de Saint-Martin will illuminate various aspects of the inner Path that connects Earth with Heaven and will reveal the highest initiatory secret: the ability of the incarnated human being to achieve here and now the miracle of his spiritual transmutation and transformation into a Divine Emissary on earth.