While Europeans were figuring out what to do with Edgardo Mortara, church law, and papal power, other parts of the Christian world (okay, Protestant) were also struggling to sort out the temporal and spiritual realms. In 1834 the Afscheiding rejected the Dutch ecclesiastical establishment and opted for a church free from the constraints of political compromise. (Of course, many of these Dutch Calvinists still wanted a return to the Dutch republic of Dort’s Synod’s fame.) A similar secession occurred among the Scots when in 1843 the Free Church abandoned the comforts of the Kirk for an ecclesiastical existence free from state control. (Of course, Thomas Chalmers was loathe to call this a voluntary church – despite the name “Free” – and repeatedly affirmed that the Free Church stood for the establishment principle; this meant that the Free Church still preferred ecclesiastical establishment but only on orthodox terms.) And then there was the case of the Old School Presbyterians, who had no ecclesiastical establishment to repudiate but did reject the blurring of nationalism and Presbyterianism on display among the New School Presbyterians. This rejection involved the doctrine of the spirituality of the church – the idea that the church is a spiritual institution with spiritual means for spiritual ends.
In each of these cases, Reformed Protestants were coming to a clearer understanding of the church’s spiritual character thanks to the lessons taught by church entanglements with temporal power.
The Vatican, thanks to the case of Edgardo Mortara and a European consensus, needed also to come to grips with a church vacated of temporal power and limited to spiritual authority. Italian republicans attempted to their best efforts to teach this lesson to the papacy when in 1849 they drafted an Italian Constitution that included these articles:
1) The papacy’s rule and temporal power over the Roman State is declared over.
2) The Roman Pontiff will have all the guarantees necessary for his exercise of spiritual authority.
3) the form of the government of the Roman State will be pure democracy, and will take the glorious name of the Roman Republic. (David Kertzer, The Kidnapping of Edgardo Mortara, 22)
What conservative Reformed Protetants adopted freely with some minor discomfort, the conservative papacy had imposed on it by European politics.