A Jesuit revisits the foundational documents and history of the Society of Jesus and makes the 30-day Spiritual Exercises again — in a sense reaffirming his vocation.
The tertian participates in an approximately nine-month program that also includes spiritual training and apostolic experiment.
Before tertianship begins priests must be ordained, or in the case of brothers complete their studies, followed by several years of work. Once ready the tertian participates in an approximately nine-month program that includes spiritual training, an apostolic experiment and making the 30-day Spiritual Exercises for a second time.
As he did as a novice, a Jesuit in tertianship once again makes the Spiritual Exercises of St. Ignatius Loyola. Known as the Long Retreat, the tertian prays in silence for 30 days, letting the Lord work on him.