2 Corinthians
From the beginning, early church fathers have seen 2 Corinthians as one complete letter from the hand of Paul. However, there has arisen a new theory that sees 2 Corinthians as the combination of two letters from the hand of Paul. The last four chapters are seen as a separate, harsh, letter that was appended to the end of the original 2 Corinthians (ch. 1-9)
First, God honored Paul by giving him visions and revelations. Paul saw the glorified Christ on the very day he was converted (Acts 9:3; 22:6). He saw a vision of Ananias coming to minister to him (Acts 9:12), and he also had a vision from God when he was called to minister to the Gentiles (Acts 22:17).
During his ministry, he had visions from God to guide him and encourage him. It was by a vision that he was called to Macedonia (Acts 16:9). When the ministry was difficult in Corinth, God encouraged Paul by a vision (Acts 18:9-10). After his arrest in Jerusalem, Paul was again encouraged by a vision from God (Acts 23:11). An angel appeared to him in the midst of the storm and assured him that he and the passengers would be saved (Acts 27:23).