In truth, we do not know exactly how the canon was determined. It seems to have been the result of a gradual grassroots process that evolved at different rates in various parts of the Roman Empire. There is no evidence of a single council of the church making the decision at a single moment in time. The earliest reflections (early fourth century) on the process can be found in Eusebius, The Ecclesiastical History 3.25; 6.14.1–2, 6.25.3–14.