This second volume in a four book series of the writings of Tertullian focuses on the teachings of a heretic named Marcion. This work mainly shows the error of Marcion's theology and the gnostic basis of the teaching. Although we no longer have many of the original teachings of the first and second century Gnostics we are able to use works like this to try and piece them together. Tertullian was adamant in showing the error of the Gnostic way of using the Bible and adequately shows the heresy that lies within the fabric of Gnostic thought that made it so dangerous.