If faith is real, the works will be there. If faith is not real, the works will not be there. Furthermore, whereas the other two judgments are personal and private, this one is public and corporate. In looking at the Final Judgment we begin by asking about its necessity. To say this is to deny the doctrine of election.
Scripture suggests three purposes.
First, the outstanding purpose of the Final Judgment will be to display the glory and sovereignty of God. It displays the glory and sovereignty of God in revealing the destiny of His elect. It is God's grace that is magnified in the salvation of His people what a great and wondrous salvation it is for people who are miserable, undeserving, and unworthy. It also displays the glory and sovereignty of God in revealing the destiny of the reprobate. Who forever banishes all sin and evil from His presence.