Occasion. The eighteenth of the twenty-five Public Disputations printed in the Opera and in Nichols's English, defended under Arminius by the respondent whom Nichols prints as Gerard, the Son of Helmichius. It follows the disputation on repentance and precedes the disputation on the justification of man before God. The Leiden holdings list a 1605 quarto, Disputatio theologica de ecclesia eiusque capite, as the printed form of this disputation.
The doctrinal move. A short preface says that a right belief about the church and its Head matters, given the present controversy between the Orthodox and the Papists. Thesis I takes the word ecclesia as a congregation of persons called out, whatever their number, so that a large assembly is a greater church but not more a church; Thesis II defines the church of God as a congregation of men called forth by God into the supernatural dignity of adoption, and of those who answer, and sets the angels aside. Men are then considered in the primeval state (III), in which the church existed by the primitive creation and the Legal covenant, and after the Fall (IV), when the first parents fell from that covenant and ceased to be the church. A church is to be gathered again through the new and gracious covenant, to which men are called first by the promise of the Blessed Seed and afterwards by the full manifestation in the Gospel (V); this is one church, not two, one heir, one new man, one city, one house of God (VI), called in its widest extent the Catholic Church and distributed into the church before Christ and the church after Him (VII). The Christian Church is defined as a congregation of believers ingrafted into Christ as living members to the Head, and the Catholic Church is said to differ from particular churches only in amplitude (VIII). The theses then run through its causes in order: the Efficient Cause and the Instrumental Causes (IX), the calling forth with its point of commencement, point of termination and means (X), the Matter (XI), the Form as Union, Subordination and Influence (XII), and the Chief End (XIII). The church is distinguished as militant and triumphant (XIV), as Visible and Invisible (XV), and, with respect to doctrine, worship and morals, as Orthodox or Heretical, Idolatrous or not, purer or more impure (XVI). Thesis XVII asks whether an assembly that errs can be the church, and answers that the church on earth will never wholly fail. Turning to the Head, Thesis XVIII holds that the conditions of a Head agree with Christ alone. Thesis XIX gives eight reasons why the title cannot be adapted to the apostle Peter, and Thesis XX lists four propositions the Papists must first prove before it could pass to the Roman Pontiff.