Discernment:

Gift and Mystery, On the Fiftieth Anniversary of My Priestly Ordination Pope John Paul II
To Save a Thousands Souls Fr. Brett A. Brannen
Pastores Dabo Vobis Pope John Paul II
Jesus of Nazareth: From the Baptism in the Jordan to the Transfiguration Pope Benedict XVI
The Bible! RSV (Catholic Version) or Douhay Reims (Haydock version)
Vatican Council II: The Conciliar and Post-Conciliar Documents ed. Austin P. Flannery (2 Vols)
Many Are Called: Rediscovering the Glory of the Priesthood Dr. Scott Hahn
Spiritual Exercises of Saint Ignatius St. Ignatius of Loyola / tr. Anthony Mottola
Story of a Soul: The Autobiography of St. Therese of Lisieux St. Therese of Lisieux / tr. John Clarke

 

Priesthood

The Joy of the Priesthood  Steven J. Rossetti
The Grace of Ars Fr. Frederick Miller
Christ: The Ideal of the Priest Bl. Columba Marmion, OSB
The Catholic Priest as Moral Teacher and Guide (A Symposium) J. Ratzinger
Priests for the Third Millennium Arch. Timothy Dolan

 

Celibacy and Chastity

The Courage to be Chaste Fr. Benedict J. Groeschel, OFM
Priestly Celibacy: Its Scriptural, Historical, Spiritual, and Psychological Roots Fr. Peter Stravinskas, ed.
The Apostolic Origins of Priestly Celibacy Christian Cochini
Christian Totality: Theology of The Consecrated Life Frs. Basil Cole, O.P. and Paul Conner, O.P.

 

Classics

The Imitation of Christ                                              Thomas a Kempis
The Confessions                                              St. Augustine
Sermons of Cure de Ars                                              St. John Vianney
Divine Mercy in my Soul                                              St. Faustina
The Way                                               St. Josemaría Escrivá