Luke inherited the high traditions of Greek historical writing, and had access to various excellent sources of information about the events with which he dealt, besides being himself present at some of the incidents which he narrated. We have already mentioned some of the sources, written and oral, on which he may have drawn.’ The value of his work may be realized if we compare our relatively’ ample knowledge of the progress of Christianity before AD 60 with our ignorance of it for many years after that date; indeed, after Luke there arose no writer who can really be called a historian of the Christian Church until Eusebius, whose Ecclesiastical History was written after Constantine’s Milan Edict of Toleration (AD 313).

–F.F. Bruce, The New Testament Documents: Are They Reliable?