"Belief" was the second single from John Mayer's 2006 album Continuum. The song features Ben Harper on guitar.
Despite its success on the American adult album alternative chart and the South African Top 40, the song never had a music video. The song was nominated for Best Male Pop Vocal for the 50th Annual Grammy Awards. The song is about the moral war around the world with people's other beliefs and that one cannot keep the world under control to get every single person to believe just one thing.