[2] He joined Salesians on the advice of Father Garelli and entered the Novitiate.

[5][3][1][4] Callistus was inspired by the words of Bishop Luigi Versiglia who spoke of the missions to the Brothers on his visit to Turin in 1922 and wanted to join the mission in China.

[1][4][5][3] On 13 February 1930, Caravario was accompanying Versiglia on his pastoral visit to his mission in Lianzhou and there were some young boys and girls with them.

Versiglia and Callistus tried to stop them but they were hit by the guns by the pirates and fell unconscious.

He was canonized on 1 October 2000 along with Luigi Versiglia by John Paul II.