This paper uses close textual reading to examine the apostle Paul's thinking on marriage in the context of the Corinthian church. Paul promoted celibacy, but he did not oppose marriage and allowed rightful sex in marriage. In Paul's opinion, Christians should respect their non-Christian spouses' beliefs, and should not divorce a spouse on account of their non-Christian faith. Paul used the metaphor of sanctification to consolidate mixed marriages between Christians and non-Christians. Paul's teaching was relatively advanced for his context, and could promote the stability and development of the house church in Corinth.