What does 2 Thessalonians 2:14 mean?

In this verse Paul reminds his readers that God used the good news of salvation to call them for a purpose. He called them to share the glory of our Lord Jesus Christ. When Jesus was on earth, He took Peter, James, and John up a high mountain and was transfigured before them (Luke 9:28–36). His inner glory shone through His body, and later John and Peter reflected on what had taken place. John wrote: "We have seen his glory, glory as of the only Son from the Father, full of grace and truth" (John 1:14). Peter wrote, "We were eyewitnesses of his majesty . . . for we were with him on the holy mountain" (2 Peter 1:16–18). In his letter to the Colossians Paul said Christ in believers is the hope of glory (Colossians 1:27). Now, we hope to share in Christ's glory, but when He appears, we will appear with Him in glory (Colossians 3:4).