Answer
Gnostics, as recipients of Ignatius of Antioch's letters, faced criticism for their beliefs. Specifically, Ignatius countered their dualistic view of matter as evil, arguing instead for the goodness of creation and the potential for salvation through Jesus Christ. He upheld foundational Christian teachings, rejecting Gnostic ideas of secret knowledge and denying the divinity of Jesus, emphasizing the importance of faith, love, and unity within the Christian community.