Exposcit Debitum (Latin for The Duty requires) is the title of the Papal bull (or 'Apostolic Letter') that gave a second and final approval to the foundation of the Society of Jesus (the Jesuits). It was issued by Pope Julius III on July 21, 1550. It replaced Regimini militantis Ecclesiae of 1540. The structure of the text is basically the same but, based on a 10 years experience, modifications were introduced:

  1. the limitation to 60 members is removed
  2. it allowed the admission of Coadjutors, that is: zealous but uneducated priests (spiritual coadjutors) and competent lay people desirous to offer their life for an apostolic service (temporal coadjutors) The temporal coadjutors are nowadays called Jesuit Brothers.
  3. Defence of the faith is added to its Propagation as an aim of the Society of Jesus (the 10 years separating this text to the first approval, have been enough for St Ignatius of Loyola to realize how dangerous for the Catholic faith was the rapid progress of Protestantism)

Exposcit Debitum is still the referential papal document, a sort of foundational chart, for whatever deliberation takes place on the identity and mission of the Jesuits in the world of today.


  • (Text in Latin): Constitutiones Societatis Iesu, Romae, 1937, pp.xxiii-xxxiii.
  • (Text in English): GANSS, George (ed), The Constitutions of the Society of Jesus, St Louis (USA), 1970, pp.63-72.

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