In Chapter XXXIII of his great work The Three Ages of the Interior Life: Prelude of Eternal Life, (St. Louis, MO: B. Herder Book Co., 1946), Rev. Fr. Reginald Garrigou-Lagrange explains the principles that are important to understand if we wish to have an appropriate esteem of prayer: the great means of salvation and perfection, as St. Alphonsus taught.
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