According to its Constitutions, "the purpose of the Society is the evangelisation and the implanting of the Church in missionary lands known as mission Ad Gentes.
[4] On 30 June 1910, De Piro accepted the first two members, Joseph Caruana and John Vella.
[13] Then, in 1982, when Fr Stanley Tomlin was Superior General, the Society opened its first mission in Asia when it sent two missionaries to Faisalabad, Pakistan.
[15] The latest mission of the MSSP is Cuba, established in 2017, when two Peruvian missionaries were sent to Santa Clara, by the present Superior General, Fr Mark Grima.
Although still small in number, the Holy See granted this privilege to the Society in recognition of the apostolic zeal by which this congregation was embracing its mission and as an encouragement to continue to move forward.