13 But as for you, brethren, do not grow weary in doing good. 14 And if anyone does not obey our word in this epistle, note that person and do not keep company with him, that he may be ashamed. 15 Yet do not count him as an enemy, but admonish him as a brother. (2 Thessalonians 3:13–15, NKJV)
From time to time the question arises whether a fallen away Christian is, in fact, still a brother or sister in Christ. Today’s passage helps us understand that fallen Christians are still brethren, albeit, brethren in sin in need of discipline and warnings to try to bring about their repentance. Verse 13 refers to “brethren” who are faithful not to grow weary in doing the good things of God. The “anyone” of verse 14 is any Christian who becomes weary of doing good (being faithful) and “walks disorderly” (2 Thessalonians 3:6). Normal social contact with that person is to cease in a disciplinary attempt to cause him to be ashamed of his sin and repent (2 Corinthians 7:9-10). Verse 15 directly says the wayward Christian is “a brother” whom we continue to warn rather than treat as an enemy. Therefore, we conclude that one who falls from the faith is an erring brother or sister – an erring child of God who needs repentance and prayer to be forgiven by God (James 5:19-20; Acts 8:22).
47 Then one said to Him, “Look, Your mother and Your brothers are standing outside, seeking to speak with You.” 48 But He answered and said to the one who told Him, “Who is My mother and who are My brothers?” 49 And He stretched out His hand toward His disciples and said, “Here are My mother and My brothers! 50 For whoever does the will of My Father in heaven is My brother and sister and mother.” (Matthew 12:47–50, NKJV)
Family relations are very important to us, and that is a good thing. But, relations of the flesh do not supersede the spiritual relationship we must have with Jesus Christ. That is the fundamental lesson of this passage. John the apostle introduced his gospel by affirming this truth. He wrote, “But as many as received Him, to them He gave the right to become children of God, to those who believe in His name: who were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God” (John 1:12-13). Being in the kingdom of God is not based on your fleshly birth and heritage, but on being born again of “water and the Spirit” (John 3:3-5). This enlightens our understanding that being a disciple of Christ demands loving Him more than our own family members (Matthew 10:37; Luke 14:26). This also supports the truth that the church is the Israel of God today, not physical Israel (Romans 2:28-29; Galatians 6:16). Be sure you are doing the will of God and that your loyalties are to Christ before every other fleshly relation (v. 50).
14 We know that we have passed from death to life, because we love the brethren. He who does not love his brother abides in death. 15 Whoever hates his brother is a murderer, and you know that no murderer has eternal life abiding in him. (1 John 3:14–15, NKJV)
The apostle John had just described the children of God as those who “practice righteousness,” making an application that loving one’s brother is the epitome of this righteous conduct (1 Jno. 3:10). The brethren of whom he speaks are fellow Christians. One’s passage from spiritual death into spiritual life is assured by practicing love toward fellow Christians. As Cain, who murdered his brother Abel, the Christian who hates a fellow Christian is a murderer. A heart filled with hate has death abiding in it; not eternal life. To detest and disregard our brethren assures that we “abide in death” and will not pass into eternal life. (Oh yes, a Christian can sin and lose his soul!) This is a powerful motive to love each other as He has love us, and by obeying the Lord, abide in His love (Jno. 13:34-35; 15:10).