5 Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test! 6 I hope you will find out that we have not failed the test. 2 Corinthians 13:5-6 [ESV]
I love this call by Paul for the Corinthians to examine and test themselves. Why? To see if they are in the faith. Here at the end of his letter he gets right down to it. He has spent a ton of time reminding them about what he those that were with him, taught them over the 2 other times he visited. The truth of the Gospel and conforming of their lives to it.
So, what an awesome instruction to us -> to examine and test ourselves. When the examination is finished the test results in a realization that Jesus Christ is me or that He isn’t. One way to test ourselves is to check for evidence of the Holy Spirit’s work in our life: “But the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control” (Galatians 5:22–23). We might consider making this our prayer as David did: “Search me, God, and know my heart; test me and know my anxious thoughts. See if there is any offensive way in me, and lead me in the way everlasting” (Psalm 139:23–24).