By definition, a debased mind is “unapproved” and, by implication, “worthless.” It does not stand the test and, therefore, is not approved. The Greeks used the word translated “debased” to metals and coins that failed the assayer’s test. So, it was cast aside, rejected, “reprobate” (KJV, ASV). The debased mind does not appear suddenly. The Holy Spirit explained that it develops when people no longer approve of holding on to their knowledge of God. Romans 1 catalogs the process and effects of divesting oneself of the knowledge of God (1:19-25). Foolishly refusing to hold God in one’s knowledge results in all manner of immoral conduct (1:26-27, 28-32). What we retain in our minds shapes our lives. We invariably spiral downward when we are comfortable with not retaining God in our thoughts. The gospel of Christ has the power to save us from the sin that is formed in and results from debased minds (Rom. 1:16-17). The gospel renews our minds when we believe, repent, and obey the Lord Jesus (Eph. 4:17-24; Rom. 12:1-2). Otherwise, our sin put us under God’s wrath and righteous judgment of death (Rom. 1:18, 32). Retain God in your knowledge and follow His will.
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. (2 Corinthians 13:5, NKJV)
The possibility of Christians becoming disqualified and lost (severed from Christ, fallen from grace, Gal. 5:4) is both implied and explicitly stated here. To be “disqualified” means to be “unapproved, i.e., rejected” (Strong’s Dictionary). Conversely, the one who is accepted is “in the faith,” that is, “Jesus Christ is in you.” To know which is true of us, Christians should do three things. 1) Examine ourselves. Like an assayer tests “a metal or ore to determine its ingredients and quality” (Merriam-Webster), we must “endeavor to discover the nature or character” (BDAG) of ourselves. Am I “in the faith” (in harmony with the gospel, Eph. 4:1), or am I deceiving myself (Gal. 6:3; Jas. 1:22-26)? 2) Test ourselves. This word means to “try, prove, put to the test,” “to make a critical examination of something to determine genuineness” (Thayer, BDAG). We must test all things, then hold fast to what is good, and reject evil (1 Thess. 5:21-22). This includes a close, careful examination of our own work and responsibilities (Gal. 6:4-5). 3) Know ourselves. This requires humility (1 Cor. 8:2). The Scriptures help us know ourselves the way God knows us (Heb. 4:12-13). God’s word corrects us so we may live in the faith, have Christ in us, and be approved before God (2 Tim. 3:16-17; 2:15; Eph. 3:17).