The Eighth and the last volume of the Letters of St. Vincent Pallotti, edited by Fr. Bruno Bayer, SAC is published and sent to all the Major Superiors. This volume is different from all the others because it is addressed to only one person: Sr. Maria Geltrude Costantini (1780-1846) of the Order of the Visitation of the Virgin Mary and its content is also different from that of the previous ones. It presents particular texts through which a spiritual director can be seen sharing his mature spiritual experiences with a religious in the process of guiding her life. At first sight the texts can appear disappointing: they are not in a chronological order, almost always the date of sending the letter is missing and many of the responses consist of only one word which, without reference to Costantini, is not easily understandable. Therefore, these texts cannot be read in hurry or one after the other. When they are understood profoundly, the reader will be rewarded by the discovery of a "pearl of great value" which underlines once again the richness of the sanctity of Pallotti and his ability to direct souls.