The letter below from Abbé Saunière to his Bishop dated 6 June 1897 is found on pages 105-110 of the book by Claire Corbu and Antoine Captier, L'Héritage de l’Abbé Saunière (1985 and 1995).

But it would be more useful to see Monsignor Billard's warnings to Abbé Saunière concerning his [overzealous] trafficking in masses activities....