For many people, when we claim that we have eternal life and we know it, it seems like the height of arrogance. Further, we are all plagued by doubts at some level. Despite all of this we should not lose heart.
God has prepared an inheritance for us and we are waiting for that day when we will fully come into it. Prophets in ancient times spoke of the salvation that we experience in Jesus Christ. We are living each day filled with hope, looking for the fulfillment of all that God has had planned since the very beginning. Belonging to Jesus for eternity is supposed to transform how we live right now.
The Thessalonian church was born in an environment of persecution. Moreover the faith of the Thessalonian believers was strong, despite having little early instruction. Many of the key passages in 1 & 2 Thessalonians deal with end times events and prophecies such as the Rapture and the Day of the Lord. Paul wanted them to stay focused on the return of Jesus Christ.