Christians can feel as though the Lord has withdrawn His smile from them and are concerned that their current or difficult state may mean that they are not truly a Christian. …This ought to be a great comfort in hardship. Adversity encourages the Christian not to rely on their good works, but to be encouraged that they are being matured and prepared for future glory with Christ. They should not question their justification when they experience trials and suffering. Instead they should remember that when they confess their sins, God is faithful and just to forgive and cleanse His people from all unrighteousness. [I added more detailed points for the initial 19 minutes of the sermon and a brief video about how God purifies the saint via tribulation.]