The 10th chapter breaks off in mid thought. When the text resumes, the epistolary style has been abandoned and the final two chapters resemble a peroration. They are often considered to be later additions from the 3rd-century. Some have attributed them to Hippolytus, based on similarities of thought and style. J.B. Lightfoot suggested that the final two chapters may have been written by Pantaenus in the mid-late second century.
