Each of the Letters comprising the Meditations on the Tarot, begin as follows:
Dear Unknown Friend,
This excerpt from the Forward sheds some light on this designation:
These meditations on the Major Arcana of the Tarot are Letters addressed to the Unknown Friend. The addressee in this instance is anyone who will read all of them and who thereby acquires definite knowledge, through the experience of meditative reading, about Christian Hermeticism. . . . As these Letters are intended only to serve, to sustain, and to support the Hermetic tradition — from its first appearance in the epoch of Hermes Trismegistus, lost in the remoteness of antiquity and become legendary—they are a definite manifestation of this millennial-old current of thought, effort, and revelation. Their aim is not only to revive the tradition in the twentieth century but also, and above all, to immerse the reader (or rather the Unknown Friend) in this current —be it temporarily or for ever. For this reason the numerous citations of ancient and modern authors which you will find in these Letters are not due to literary considerations, nor to a display of erudition. They are evocations of the masters of the tradition, in order that they may be present with their impulses of aspiration and their light of thought in the current of meditative thought which these Letters on the twenty-two Major Arcana of the Tarot represent. For these are in essence twenty-two spiritual exercises, by means of which you, dear Unknown Friend, will immerse yourself in the current of the living tradition, and thus enter into the community of spirits who have served it and who are still serving it.
The Forward is signed:
Your friend greets you, dear Unknown Friend,
from beyond the grave.
–> The Magician