THIS volume contains the quintessence of the science of the saints. It gives a correct idea of the spirit, of the heart, and of the talent of Saint Alphonsus: one might say that in it his whole soul is poured out. The entire work is divided into three parts. In the first, we resume, under another form, the considerations on the eternal truths or the Last Things, treated at greater length in the preceding volume. The second part traces and paves the way that leads to divine love, or to sanctity and true happiness, and inspires us at the same time with the desire, the zeal, and the courage to undertake everything to reach this end. The third part transports us to the summit of the holy mountain, or Christian perfection, shows us in detail the mysteries of the interior life, and enables us to breathe its sweetest perfume. ? Some persons have objected that the writings of Saint Alphonsus contain many repetitions. This is true in regard to the ascetical works; but these repetitions are not useless. There is no question here of a study, a scientific work done for the sole purpose of exercising the mind. It is a food destined to give strength to the life of the soul. Each one takes for himself everyday the amount that agrees with his spiritual temperament. But let us hear what the author himself says in regard to this matter: "I entreat my readers not to grow weary if in those prayers they always find petitions for the grace of perseverance and the grace of divine love. For us, these are the two graces most necessary for the attainment of eternal salvation." 1 He also says: "One should not find it tiresome that I repeat the texts that I have already cited several times. . . . The authors of pernicious books, who treat of obscene things, reproduce even to satiety their impure sallies in order to inflame their imprudent readers with the fire of concupiscence; and should it not be permitted to me to repeat sacred texts that are most suitable to inflame souls with divine love ?" 2 Ah, let us never grow tired of reading and meditating on what the holy bishop has had the patience to write so many times for our benefit.