The Permanent Manuscript

Sir Robert, during his quest for the Holy Grail, was struck by a spectacular vision. The images were so overwhelmingly realistic he felt compelled to document everything he had seen as a testament for all future generations. Stopping in the nearest cave, he began carving, with both words and pictographs, the amazing sights he had witnessed. Only by engraving the words deep into the stone, permanently recording his fantastic revelation, would he be certain that not a single letter of his screed could ever be altered. Thus it would forever remain.

Sir Robert liked to make his editor's job difficult.

For the prompts Manuscript and Letter.