How are believers and non-believers distinguished in Scripture?

The distinction between believers and non-believers is essential in understanding God's sovereign plan. Romans 9:21-23 illustrates this distinction by referring to believers as vessels of mercy prepared for glory, while non-believers are termed vessels of wrath fitted for destruction. This divine separation underscores the reality that all human beings fall into one of these two categories, based on God's sovereign choice, rather than any merit or decision on humanity's part. Recognizing this truth enforces the understanding of grace and the importance of sharing the Gospel to reach those currently outside the mercy of God.