The Secret Scripture of the Poor is a collection of spiritual writings born from the faith experiences of a missionary priest who lived close to the poor and human suffering. This work is not a narrative narrative, but rather a profound spiritual reflection on the meaning of poverty, suffering, and sacrifice in the light of Christian faith.

Hennaghan invites readers to see that poverty and hardship are not merely burdens, but can be a path to holiness. He interprets the experiences of the poor as a "secret scripture," God's way of speaking through the simple, limited, and often overlooked realities of life.

The main points discussed in this book include a) suffering as a participation in Christ's passion, especially through reflections on Calvary and the life of Jesus; b) poverty as a space of grace, where humans learn to depend completely on God; c) prayer and the Eucharist as sources of strength for weak and wounded souls; d) the example of Jesus, Mary, and the missionaries, who demonstrate that love and sacrifice have eternal value; e) a simple life (as in Nazareth) as a model for a meaningful life before God.

Henaghan also emphasizes that the world often views poverty as humiliation, but in faith, therein lies peace, inner strength, and closeness to God.

Overall, this book is a strengthening and contemplative spiritual reflection, especially for those experiencing life's difficulties. Henaghan shows that hidden behind suffering lies a "divine book" that guides humans toward love, hope, and salvation.