Eschatology, the study of end times, matters because it is rooted in the authority of Scripture and is essential for the church, providing guidance on how to be prepared for promised trouble, protected from deception, and awake and watchful for the return of the Lord. By understanding eschatology, believers can cultivate patient endurance, eager expectation, and a deeper longing for the Lord's appearing, ultimately leading to a life of worship and readiness for the King's return.