This letter was written by Paul while he was imprisoned Rome. The apostle is experiencing persecution for his faith but this is no surprise to him, nor is it stealing his hope. "Indeed, all who desire to live a godly life in Christ Jesus will be persecuted." (2 Tim. 3:12) He is writing this letter to encourage Timothy, his co-worker, to be strong in the Lord in spite of suffering. He calls on him to be a good soldier of Jesus Christ, as we should all strive to be ourselves.