2 Corinthians 3:2, Our Epistles Written In Our Hearts
The Corinthian Christians were saved as a fruit of the Apostle Paul’s ministry. The gospel that he preached indeed were effectual to the conversion of souls and how they renounced their idols and come to faith in Jesus Christ. It was a well-known fact that an undeniable change has taken place in their lives. There was no necessity for any letter to be written on pen and paper to authenticate the Apostle Paul’s love for them.