There is something remarkable about the origin of this book, _An Introduction to the Devout Life_, addressed by him to Philothea, that is, to every soul which desires to love and serve God, and especially to persons living in the world. One peculiarity about it is that it was composed two years before its author had thought of writing any book at all. He says on this subject in his preface: "It was by no choice or desire of mine that this _Introduction_ saw the light. Some time ago, a soul[1] richly endowed with honourable and virtuous qualities, having received from God the grace to aspire to the devout life, desired my special assistance in the matter. I, on my part, having had much to do with her in spiritual concerns, and having for a long time past observed in her a great aptitude for such a life, took great pains in instructing her. I not only led her through all the exercises suitable to her condition and aspirations, but I also gave her some written notes, to which she might refer when necessary. Later on she showed these to a learned and devout Religious man, who, considering that they might be of use to many, strongly urged me to publish them, which he easily persuaded me to do, because his friendship had great power over me, and because I valued his judgment very highly." I am able to give some further details. This soul richly endowed with honourable and virtuous qualities, as our Blessed Father described her to be, was a lady from Normandy of good family, who had married a gentleman of note in Savoy. His estates were partly in the diocese of Geneva, where he mostly resided, and he was nearly related to our Blessed Father. The lady, who was of a most pious disposition, decided that she could not possibly choose a better guide in the devout life than our Saint, her Bishop, and her relative by marriage. Blessed Francis instructed her carefully both by word of mouth and also by written lessons, which she not only kept and treasured up, but sorted and arranged according to their various subjects, so as to be able to find in a moment the counsel she wanted. For two years she went on steadily collecting and amassing these precious documents as one by one he wrote them for her. At the end of that time, owing to the disturbed state of the country, a great change came over her life. Her husband served his Prince, the Duke of Savoy, in the war in Piedmont, and was obliged to leave the management of all his affairs and of his property to his wife, who was as skilful in such matters as she was devout. The business of a great lawsuit in which her husband was concerned obliged her to take up her residence for more than six months at Chambery, where the senate or parliament was held. During her stay in this place she took for her director Père Jean Ferrier, the Rector of the Jesuit College, and confessor to our Blessed Father. In her difficulties she applied to this Father for advice, and he willingly gave it.