Brown was one of the first Catholic scholars in the United States to use the
historical-critical method to study the Bible. In 1943, reversing the approach that had existed since
Pope Leo XIII's encyclical
Providentissimus Deus 50 years earlier,
Pope Pius XII's encyclical
Divino afflante Spiritu expressed approval of historical-critical methods. For Brown, this was a "Magna Carta for biblical progress." In 1965, at the
Second Vatican Council, the Church moved further in this direction, adopting the
Dogmatic constitution on Divine Revelation, known as
Dei verbum, which superseded the conservative schema, "On the Sources of Revelation", that originally had been submitted. While it stated that Scripture teaches "solidly, faithfully and without error that truth which God wanted put into sacred writings for the sake of salvation," Brown pointed out the ambiguity of this statement, which opened the way for a new interpretation of inerrancy by shifting from a literal interpretation of the text towards a focus on "the extent to which it conforms to the salvific purpose of God." Brown saw this as the Catholic Church "turning the corner" on inerrancy, saying, "the Roman Catholic Church does not change her official stance in a blunt way. Past statements are not rejected but are requoted with praise and then reinterpreted at the same time....What was really going on was an attempt gracefully to retain what was salvageable from the past and to move in a new direction at the same time."
New Testament Christology In a detailed 1965 article in the journal
Theological Studies examining whether Jesus was ever called "God" in the New Testament, Brown wrote, "Even the fourth Gospel never portrays Jesus as saying specifically that he is God" and "there is no reason to think that Jesus was called God in the earliest layers of New Testament tradition." He wrote that, "Gradually, in the development of Christian thought God was understood to be a broader term. It was seen that God had revealed so much of Himself in Jesus that God had to be able to include both Father and Son." Thirty years later, Brown revisited the issue in an introductory text for the general public, writing, "three reasonably clear instances in the NT (Hebrews 1:8–9, John 1:1, 20:28) and in five instances that have probability, Jesus is called God," a usage Brown regarded as a natural development of early references to Jesus as "Lord".
Gospel of John Brown analyzed the
Gospel of John and divided it into two sections, which he labelled the
Book of Signs and the
Book of Glory. The Book of Signs recounts Jesus' public miracles, which are called signs. The Book of Glory features Jesus' private teachings to his disciples, his crucifixion, and his resurrection. Brown identified three layers of text in John: 1) an initial version Brown considers based on personal experience of Jesus; 2) a structured literary creation by the evangelist which draws upon additional sources; and 3) the edited version that readers of the Bible know today. ==Academic reception ==