The service is part of a daily ritual that includes a full workday, evening chapel and group Bible study.
As Josh Duggar continues to seek treatment at Reformers Unanimous in Rockford, Illinois, he's required to attend regular church services as part of the religious-based facility's program to recover from a "vicious cycle of addiction."
The service is part of a daily ritual that includes "It's Personal" devotions, a full workday, evening chapel and group Bible study.
WATCH: Inside Josh Duggar's Christian Rehab Center
One such Friday night service reviewed by ET starts with a video
outlining the center's 10 guiding principles and talks about how it’s not
possible to fight a fleshy temptation with a fleshy weapon.
After the video, everyone in attendance stands up and says what they are thankful for, and in this particular instance, that included good spirits, weight loss or special gifts they have received. From there, the members of church discuss how to keep their mind focused on Jesus and learning the word of God.
"They knew that Christ was the solution to overcoming this addiction," the patients of RU are told. "Recovery is God's give to us and what we do with that is our gift to him."
The mass continues with other inspired quotes, such as "God is the truth to freedom" and "freedom is the ability to love God."
WATCH: Josh Duggar's Christian Rehab Center Says 'Sin Always Leads to Destruction'
The church is the only reprieve from the center the patients get. Most of their day is spent inside the campus focused on recovery, performing community service and living in "military-style barracks."
The program costs a reported $7,500 for six months of treatment. Upon completion of the program, alumni are checked in with on a bi-annual basis. "They reach out to family to check on the patient," said Tony Richardson, Director of Development at Reformers Unanimous and a former patient of the center. "This is not a battle fought every day. This is a victory program."
WATCH: Josh Duggar's Family Speaks Out -- 'I Hope He Gets Broken in Rehab'
The center has been lauded by the Duggar family in the past, with Jim Bob and Michelle speaking at Reformers Unanimous' national conference last year.
In May, Josh Duggar admitted to molesting five young girls as a minor. Then in August, the 27-year-old confessed to being unfaithful to his wife Anna after being discovered in a data breach to have two paid accounts on the affair-oriented website, Ashley Madison. Josh checked himself into rehab last month, possibly seeking treatment for his sexual issues.
Learn more about Duggar's life at the center below: