He became the canon of the Spoleto Cathedral in 1898. His spiritual guide was the priest Lodovico Pieri – the latter was also the guide of Blessed Placido Riccardi.The congregation went on to flourish and received the papal decree of praise of Pope Pius X on 8 March 1911 while on 10 May 1932 receiving full papal approval from Pope Pius XI.
He died in Spoleto in 1935.
Pope John Paul II beatified Bonilli on 24 April 1988.
Bonilli died in 1935 after his health started to deteriorate from 1918; he had lost his sight in 1929. His remains were transferred from their previous location on 24 April 1988 due to the earthquake of 26 September 1997. His order now operates in places such as India and El Salvador. As of 2005 there were 58 houses and a total of 385 religious.