How does Paul describe the spiritual condition of the Corinthian church compared to Ephesus and Philippi?

Les explains that Paul makes it very plain the Corinthians were still so carnal. They were not a spiritual church like Ephesus or Philippi, but were a church beset with all kinds of problems. The first problem was divisions: some said they followed Paul, some Apollos, some Peter, and some even said they followed Christ. Paul had to address that division and defend his apostleship. Les points out that Paul constantly defended his apostleship because his early ministry went first to the Jew in the synagogue, and when the Jews rejected it, he went out into the Gentile area. Yet wherever he went there was a constant slur that he was an imposter, a renegade Jew, so he had to defend that he was God’s man for the hour. Even so, Les notes that the Corinthians, though carnal and not the most spiritual, were still co-laborers with the Apostle, which puts believers in the same place as co-laborers to bring to fruition the eternal will of God.