In order to teach at the Valsalice school,
a teaching qualification was required, so in the summer of 1900, at the age of 21, Father Cimatti obtained a diploma as "chorus master" at the famous Conservatory of Music in Parma,
and in 1903 he obtained a doctorate in natural sciences from the Faculty of Agriculture of the State University of Turin,
and in 1907 he obtained a doctorate in philosophy from the same university. He also studied theology, and was ordained a priest in 1905.
His activity as a teacher was incredible. The school was attended by both lay students and young Salesians in training.
Fr Cimatti's lessons were clear and his manner gentle and brotherly. He preferred persuasion to command.
This endeared him to his students, as evidenced by the correspondence he maintained throughout his life.
It is said that his teacher was the model for Don Bosco's educational method. At that time, he composed songs and operettas for ceremonies and rites,
creating a lively atmosphere for celebrations. He also wrote textbooks on pedagogy and agriculture for students at the normal school.
From 1912 to 1919, during the First World War, he taught school and was also responsible for the Oratorio of St. John and St. Joseph,
founded the first Scout troop in Turin, and worked tirelessly for the relief of the poor.
In 1920 he became headmaster of the normal school in Warsalice, and from 1922 he also assumed the duties of abbot.
In 1925 he wrote his last book, "Don Bosco the Educator", about Don Bosco's preventive education method.
At the end of that year, I decided to leave for Japan.