This difficult work, composed at so advanced an age, amidst sufferings almost continual, and numerous occupations, excited at Naples the admiration of learned men. According to Canon Massa, professor of theology and ecclesiastical examiner, the author in his work explains so skilfully the sense and the obscure passages of the psalms, that without taking anything from the purity of the inspired word he aids both the heart and the mind of those that read it. The Holy See has frequently praised and recommended all the works of St. Alphonsus; but the decree of March 23, 1871, which conferred on St. Alphonsus the title of Doctor of the Church, makes special mention of this work, speaking of it as one of his most useful and salutary works. The decree says: “He [St. Alphonsus] has made clear dark passages of the Holy Scriptures, both in his ascetic writings, which are freighted with a celestial odor, and in a most salutary commentary, in which, for the nourishment of piety and the instruction of the soul, he has given expositions of the Psalms, as well as of the Canticles, for the benefit especially of those obliged to its recitation.”