The Epistles of Pope Callistus
Preface.2. Of the seasons for fasting.3. Of accusations against doctors.Preface.5. Of those who conspire against bishops, or who take part with such.6. Of those who have intercourse with excommunicated persons, or with unbelievers.7. That no bishop should presume in anything pertaining to another's parish, and of the transference of bishops.8. Of marriages among blood-relations, and of those who are born of them; and of accusations which the laws reject.9. Of those who ought not to be admitted to prefer an accusation, or to bear witness; and that evidence is not to be given but on things happening in the person's presence.10. As to whether a priest may minister after a lapse.