For while one says, I am of Paul; and another, I am of Apollos; are you not carnal?
All Commentaries on 1 Corinthians 3:4 Go To 1 Corinthians 3
John Chrysostom
AD 407
It was the factionalism of the Corinthians that produced jealousy, and that in turn made them carnal. Once they were carnal, they were no longer free to hear truths of a more spiritual kind.