Writing of "Against Nestorius"

"Against Nestorius" is a theological work written by Saint Cyril of Alexandria to counter the teachings of Nestorius, who denied that Jesus Christ was both fully divine and fully human. Nestorius proposed separating Jesus's divine and human natures, which threatened the unity of Christ's person. Cyril's writing affirms that Jesus is one person with both divine and human natures united inseparably. This work played a key role in shaping orthodox Christian beliefs and was influential in the Council of Ephesus (431 AD), seeking to uphold the understanding that Christ’s divine and human aspects coexist in one person.