The letter of a philosopher concerning the secret of the gr~1

This enigmatic title refers to an alchemical letter or tract centered on a hidden secret of transformation, likely part of the coded literature of the hermetic-alchemical tradition. Its significance lies in its place among texts that use symbolic and cryptic language to convey esoteric knowledge, and readers will find brief philosophical reflections and hints toward alchemical doctrine.

Works whose authorship is unknown, unattributed, or pseudonymous. This is a standardized placeholder that consolidates anonymous attributions across languages (Anónimo, Anonyme, Аноним, Unknown, and others). The original source attribution for each text is preserved with the individual work.