A Short Treatise on Prayer
By St. Alphonsus Liguori · Published by TAN Books
Overview
Salvation depends on prayer. St. Alphonsus Liguori asserts this truth with startling clarity in The Necessity of Prayer, one of the most penetrating spiritual works ever written on the absolute importance of petition before God. While God wills the salvation of all men, St. Alphonsus teaches that He has ordained prayer as the necessary means by which souls obtain the graces required for perseverance, conversion, and eternal life.
This is not abstract theology or sentimental encouragement. It is practical spiritual direction written for souls engaged in the real struggle for holiness. Alphonsus exposes the tragic silence of those who neglect prayer while illuminating the victorious perseverance of the saints who cling to God through continual petition. He writes especially for the weak, the tempted, and the fallen, showing that no soul is abandoned who perseveres in humble and confident prayer.
With theological precision and pastoral urgency, St. Alphonsus explains the indispensable conditions of effective prayer: humility before God, unwavering confidence in divine mercy, and perseverance even amid dryness, failure, and suffering. He also refutes common errors that deny the power or necessity of human petition, grounding his teaching firmly in Scripture, tradition, and the witness of the saints.
More than a devotional work, this book is a spiritual wake-up call. It trains the soul to rely not on self-sufficiency, but on continual dependence upon grace. For St. Alphonsus, prayer is not optional for the Christian life. It is the lifeline of salvation itself.
What This Book Teaches:
- The Necessity of Prayer: Understand why prayer is essential for salvation and perseverance.
- Practical Spiritual Guidance: Learn how to pray with humility, confidence, and constancy.
- Strength Against Temptation: Discover how prayer obtains grace in moments of weakness and trial.
- Catholic Teaching on Grace: Deepen understanding of divine aid, free will, and sanctification.
- Learn Why Prayer Is Essential: Understand the connection between prayer, grace, and salvation.
- Strengthen Perseverance: Gain practical direction for remaining faithful amid temptation and suffering.
- Deepen Trust in God: Cultivate confidence in divine mercy and providence.
- Receive Traditional Spiritual Wisdom: Study one of the Church’s greatest masters of moral theology.
- Transform Daily Spiritual Life: Build a disciplined habit of continual reliance upon prayer.
From the Book
“He who prays is certainly saved; he who does not pray is certainly damned.”
— St. Alphonsus Liguori
Intended Audience
This book is ideal for Catholics seeking a more serious and disciplined interior life, especially those struggling with temptation, discouragement, habitual sin, or spiritual dryness. It is particularly valuable for readers who desire practical instruction rather than vague inspiration.
Clergy, seminarians, catechists, and lay faithful alike will find in these pages a masterful explanation of grace, perseverance, and the indispensable role of prayer in the Christian life.
Practical use cases include personal spiritual reading, retreat meditation, confession preparation, parish study groups, and daily devotional formation.
FAQs
Why does St. Alphonsus say prayer is necessary for salvation?
He teaches that God grants the graces necessary for perseverance and holiness through prayer, making it the ordinary means by which souls receive divine assistance.
Is this book theological or practical?
It is both. The book explains Catholic teaching on grace and salvation while also providing concrete spiritual guidance for daily prayer.
Is this work difficult to understand?
No. Though doctrinally rich, St. Alphonsus writes with clarity and pastoral directness accessible to ordinary Catholics.
Who was St. Alphonsus Liguori?
St. Alphonsus was a Doctor of the Church, founder of the Redemptorists, and one of the greatest Catholic moral theologians and spiritual writers in Church history.
Key Themes
- The Necessity of Prayer: Prayer as the ordinary means of obtaining grace and salvation.
- Perseverance in Grace: Remaining faithful through continual dependence upon God.
- Humility and Confidence: The essential dispositions for effective prayer.
- Spiritual Warfare: Prayer as protection against temptation and sin.
- Traditional Catholic Spirituality: Clear doctrinal teaching rooted in Scripture and the saints.
- Author:
- St. Alphonsus Liguori
- Publication Date:
- 6/1/2026
- Pages:
- 160
- Height:
- 7.00
- Width:
- 5.00
