The Hidden Treasure, subtitled "Or the Immense Excellence of the Holy Sacrifice of the Mass," is a devotional work exploring the theological significance and spiritual benefits of the Catholic Mass. Penned by Leonard, this book delves into the profound mysteries of the Eucharist and its central role in Christian life.

The text emphasizes the Mass as a sacrifice and a source of grace, guiding readers toward a deeper understanding and appreciation of its immense value. This edition also includes prayers suitable for use during Mass, enhancing the reader's active participation and devotion. A classic work aimed at fostering a more intimate relationship with God through the Holy Eucharist.

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