The D180 book is a hardcopy version of the contents of this website. Some men prefer the hardcopy version, especially as they complete their daily readings in the church or chapel.

Grow in Holiness, Whatever Your Call

The book explains how to prepare for D180, leads you through creating a rule of life, and includes weekly self-evaluations. The bulk of the book contains various spiritual passages:. 

Includes short daily readings from:
Introduction to the Devout Life, by St. Francis de Sales
The Discernment of Spirits, by St. Ignatius of Loyola
Confessions, by St. Augustine
Story of a Soul, by St. Therese of Lisieux
Ad Catholici Sacerdotii, by Pope Pius XI
Proclaiming a Year for Priests, by Pope Benedict XVI
Pastores Dabo Vobis, by Pope St. John Paul II
Sacerdotalis Caelibatus, by Pope St. Paul VI
Audiences by Pope Benedict XVI & St. John Paul II
Various scripture passages

About the Author and Creator of D180

Fr. Greg Gerhart is a priest of the Diocese of Austin, TX. He grew up in Allen, Texas, and heard his vocation to the priesthood at the age of 14 when attending the Pines Catholic Camp. Before entering seminary, he graduated from Texas A&M with a B.A. in English. In college he worked at the Pines, taught catechism at St. Thomas Aquinas, and played for the men’s ultimate frisbee team, eventually becoming the captain/coach his senior year. Fr. Greg attended seminary at St. Joseph Seminary College in Louisiana and the North American College in Rome, and was ordained to the priesthood in 2016. Since being ordained, Fr. Greg has finished a Licentiate in moral theology from the Angelicum, served as associate pastor of San Jose in Austin and St. Mary’s in College Station, and now serves as the Vocation Director.

Fr. Greg explains the origins of D180 as arising from his lived experience: “As I worked with young men, I began to see that they needed more structure in their lives, especially while they’re seeking to know their vocations.” He also wanted to offer men deep content, not “fluff”, and so he drew from the Church’s greatest saints and theologians for the daily readings. “So far D180 has borne incredible fruit in my own diocese,” he said. “I’m glad to offer it to any young man who needs guidance as he listens for God’s call.”

“A comprehensive rule of life tailored specifically for those discerning their vocations.”

Fr. Buettner


“A surefire way to give the Holy Spirit ample room to convict one’s heart—and either enter the seminary or peacefully close the door on the priesthood.”

Bishop Toups


“Most priests discerned priesthood over many years; often way too many years! Fr. Gerhart has given discerners a way to step up to the plate, make a holy, prayerful, and disciplined discernment in 180 days, and then make a decision.”


Fr. Brett Brannen