What does the Bible say about self-examination in faith?

In 2 Corinthians 13:5, the Apostle Paul commands believers to examine themselves to see whether they are in the faith. This self-examination is crucial for understanding if one truly possesses the faith that saves. The faith referenced here is not merely about having enough belief, but rather a questioning of whom you truly believe in—whether it is the true Christ as revealed in Scripture or a counterfeit. Self-examination should lead to a deeper understanding of the gospel and one's relationship with Christ, prompting one to test their beliefs against the biblical truths about who Jesus is and what He accomplished for salvation.