We are not told what part Willock took in the conversation.

The arguments turned on biblical analogies, never really coincident with the actual modern circumstances.

The analogy produced in discussion by those who did not go to all extremes with Knox did not, however, lack appropriateness.
Christianity, in fact, as they seem to have argued, did arise out of Judaism; retaining the same God and the same scriptures, but, in virtue of the sacrifice of its Founder, abstaining from the sacrifices and ceremonial of the law.

In the same way Protestantism arose out of mediaeval Catholicism, retaining the same God and the same scriptures, but rejecting the mediaeval ceremonial and the mediaeval theory of the sacrifice of the Mass.

It did not follow that the Mass was sheer "idolatry," at which no friend of the new ideas could be present.
As a proof that such presence or participation was not unlawful, was not idolatry, in the existing state of affairs, was adduced the conduct of St.Paul and the advice given to him by St.James and the Church in Jerusalem (Acts xxi.