If you are a believer, then you are “sanctified”, you are a saint (same root word). The word sanctification means “to set apart for a particular purpose.” There is no ceremonial act—not even baptism or the Lord’s Supper—which is needed in order to be saved, or sanctified. This may be confusing, however, because the Bible often talks about, even exhorts us to, sanctification as a goal. This is because there is more than one aspect to God’s setting us apart; he sets apart in different ways and for different purposes.
Examine yourselves, to see whether you are in the faith. Test yourselves (2 Corinthians 13:5). Paul’s exhortation to be regularly testing the sincerity and purity of your own faith is not given in order to make you doubt your salvation every other day. Faith in Christ is exactly that: faith in Jesus’ finished work, not in our own faithfulness. However, we are to be regularly doing the hard work of honest self-appraisal.
But he said to me, “My grace is sufficient for you, for my power is made perfect in weakness.” Therefore I will boast all the more gladly of my weaknesses, so that the power of Christ may rest upon me. For the sake of Christ, then, I am content with weaknesses, insults, hardships, persecutions, and calamities. For when I am weak, then I am strong (2 Corinthians 12:9-10). After Paul fervently prayed for God to remove a particular trial from his life, he received an answer.
Exhort one another every day, as long as it is called “today,” that none of you may be hardened by the deceitfulness of sin (Hebrews 3:13). I was thinking this past week about cases where a person who has been a professed believer, maybe even a well-known Christian leader, falls into public sin or even apostasy, walking away from the Christian faith. Sadly, there have been many such cases in the news lately.