 After his Jesuit training in Lithuania – philosophy (1747–50) and theology (1753–57) at Academy of Vilnius – Czerniewiecz taught grammar and poetry in the Kražiai College (1750–53) before being called to Rome where he was secretary for the Polish Assistancy of the Society of Jesus (1759–68).This is where he got familiarized with the government of the society.He returned to his country where he was made rector of the Jesuit College in Polatsk (now in Belarus) in 1770.