In an earlier letter, Paul had told the Corinthians that he would return to visit them. But later he needed to change his plans. Because of this the Corinthians thought that they could no longer trust Paul. They thought that he said one thing but did something else.
If they couldn’t trust him, they couldn’t trust the good news he preached. Paul made it clear that the Corinthian believers could trust what he said. The message about Jesus that he, Silas and Timothy preached could also be trusted. They preached that God is always faithful. God will keep all the promises he made.
Jesus’ death on the cross and his resurrection show that this is true. Paul said that believers are anointed. This means that God has chosen them to be part of his family. God’s Spirit lives inside them. The Holy Spirit helps them to be sure that God will keep his promises.