The concept of mortal sin has been a fundamental part of Christianity since its inception, embraced by the early Church Fathers. However, the belief in "once saved, always saved" originated with John Calvin in the mid-sixteenth century, deviating from the views of Martin Luther and others. This theological novelty led to confusion and despair among believers regarding salvation and the seriousness of sins. Thankfully, most Christians today reject Calvin's teaching and recognize the existence of mortal sins, which can jeopardize salvation unless repented. The early Church Fathers acknowledged the salvific power of baptism but also the possibility of losing grace through serious sins.
In this PDF download you'll get examples of what early Christian writers had to say on the subject of mortal sin:
- The Didache
- Hermas
- Ignatius of Antioch
- Justin Martyr
- Irenaeus
- Tertullian
- And, many others!