Robinson concluded that much of the New Testament was written before AD 64, partly basing his judgement on the sparse textual evidence that the New Testament reflects knowledge of the destruction of the Temple in Jerusalem in AD 70. In relation to the four gospels' dates of authorship, Robinson placed Matthew as being written sometime between AD 40 and the AD 60s, Mark sometime between AD 45 and AD 60, Luke sometime during the AD 50s and 60s and John sometime between AD 40 and AD 65 or later. Robinson also argued that the letter of James was penned by a brother of Jesus Christ within twenty years of Jesus' death; that Paul authored all the books attributed to him; and that the "John" who wrote the fourth Gospel was the apostle John. Robinson also suggested that the results of his investigations implied a need to rewrite many theologies of the New Testament.