Final answer:
Paul is an influential figure in the spread of Christianity, discussing topics like overcoming sin and the issue of slavery.
Step-by-step explanation:
Paul, also known as Saul, was an influential figure in the spread of Christianity in the ancient Mediterranean world. He played a major role in cities like Ephesus, Corinth, Thessalonica, and Rome. In Romans 8:13, Paul discusses how believers should put to death the sinful nature through the power of the Holy Spirit. In 1 Corinthians 7:20-24, Paul addresses the issue of slavery and advises individuals to remain in the circumstances they were in when they became followers of Jesus.