Evangelicalism is a Protestant Christian movement. In typical usage, the term "mainline" is contrasted with "evangelical". Most adherents consider the key characteristics of evangelicalism to be: a belief in the need for personal conversion (or being "born again"); some expression of the gospel in effort; a high regard for Biblical authority; and an emphasis on the death and resurrection of Jesus. David Bebbington has termed these four distinctive aspects "conversionism," "activism", "biblicism", and "crucicentrism", saying, "Together they form a quadrilateral of priorities that is the basis of Evangelicalism."