Elaine Pagels, professor of religion at Princeton University and an authority on Gnosticism, declined to judge (in her book The Gnostic Paul) whether Paul was actually a Gnostic. Instead, she concentrated on how the Gnostics interpreted Paul's letters and how evidence from gnostic sources may challenge the assumption that Paul wrote his letters to combat "gnostic opponents" and to repudiate their statement that they possess secret wisdom.[185]