Any book written by a saint is a treasure, but a book written by one, who was hailed in his time as the angel of the Apocalypse, his Treatise consists of nineteen brief instructions on a variety of timeless spiritual topics, all but two of which are easily translatable to the lay apostles of today. The reader will find especially relevant this great preacher s remedies for getting rid of the devil, keeping him always at bay, and discerning true from false revelations.