Examine Yourselves
2 Corinthians 13:5
Examine yourselves as to whether you are in the faith. Test yourselves. Do you not know yourselves, that Jesus Christ is in you?—unless indeed you are disqualified.

See our Discern magazine article “‘Examine Yourselves’: What Does It Mean to Be Disqualified?” for a deeper study of this passage.
For more about self-examination and conversion, see the articles in the section on “Christian Conversion.”