 After defending two thesis (one on morals in comedies of Nikolai Gogol and another on theology "De conservatione mundi per Deum"), he was awarded the Master of Theology in summer 1879.After the graduation, Jaunius was offered a teaching position at the academy in Saint Petersburg, but Bishop did not approve it and appointed Jaunius as vicar of Kaunas Cathedral in December 1879.In September 1880, he became teacher of Latin, catechism, and moral theology at the Kaunas Priest Seminary.