Verse 10: By this the children of God and the children of the devil are obvious: anyone who does not practice righteousness is not of God, nor the one who does not love his brother.
John now moves on to the subject of the believer’s practice of righteousness. He begins by noting that there are two categories of believers: children of God and children of the devil.
Children Clarified
At the outset, to classify believers as being children of God is understandable, but how is it that John could classify believers as children of the devil? This can be explained by first examining how John uses the word children. This word occurs only 15 times in his writings: 3 times in his gospel account, 9 times in his epistles and 3 times in the Revelation. The majority of the time he is referring to a family relationship that influences the believer. Children are dependent upon a family authority figure for training and discipline. Thus the believer who submits to God’s authority is trained in the true character of Jesus Christ and is a legitimate child of God.
However, the believer who rejects God’s authority will also reject His training in righteousness. The Apostle Paul explains that this can actually happen to a believer:
But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons. (1 Timothy 4:1)
What Paul means by the latter times is equivalent to John’s reference that it is the last hour (2:18). Those who "fall away from the faith" exemplifies the times in which we live. These believers either never moved forward in their spiritual lives after having believed in Jesus Christ for salvation or have failed to embrace or have rejected sound doctrinal truth. Instead, their training comes from the demonic wisdom of this present age and John rightfully calls them children of the devil. Some Biblical scholars object to ascribing this characterization to believers; they wrongfully suppose that John is referring strictly to unbelievers. However, there is corroboration of other New Testament writers who harshly denounce believers that are influenced by the devil: “Hostile towards God” (Romans 8:7); “They are enemies of the cross of Christ” (Philippians 3:18); “An enemy of God” (James 4:4). Even Our Lord remarked how it was impossible for believers to have split loyalties:
“No one can serve two masters; for either he will hate the one and love the other, or he will be devoted to one and despise the other. You cannot serve God and wealth.” (Matthew 6:24)
As a child of the devil, the believer allows himself to be under the influence the devil’s training and thus imitates the unbeliever. It is one thing to have never moved forward after faith in Christ, but it is tragic to see a fellow believer that God had “began a good work in” (Philippians 1:6) to fall away and reject His grace provision for life, even after they “have tasted the heavenly gift and have been made partakers of the Holy Spirit” (Hebrews 6:4b). Thankfully, there is cleansing and forgiveness available for them (1 John 1:9).
The Obvious Difference
We are able to detect the obvious difference between those who are children of God and those who are children of the devil. But those who are the children of God should be careful that they are not using this knowledge as a basis for displaying animosity towards fellow believers. We should adhere to Paul’s advice:
Now I urge you, brethren, keep your eye on those who cause dissensions and hindrances contrary to the teaching which you learned, and turn away from them. (Romans 16:17)
And at the same time follow the Apostle Peter’s directive:
To sum up, all of you be harmonious, sympathetic, brotherly, kindhearted, and humble in spirit; not returning evil for evil or insult for insult, but giving a blessing instead; for you were called for the very purpose that you might inherit a blessing. (1 Peter 3:8–9)
It might be wise to avoid the erring brothers in Christ, but not arrogantly snubbing them, instead respectfully praying for them. We need to tend to our own relationship with the Lord and allow the Holy Spirit to do His convicting work with disobedient believers.
Practicing Righteousness
For the believer to practice righteousness means that they are consistently producing a clear indication of their relationship with Jesus Christ. The believer’s production of righteousness is based upon His truth standards and comprises all that they think and do. As previously considered in 2:4, His truth standards are contained in His commandments. Kenneth Wuest explained what His commandments are and where to find them:
The precepts (commandments) are those given by our Lord either personally while on earth or through His apostles in the New Testament Books.1
This means that they must be discovered through a careful and thorough study of Scripture. Numerous examples were observed in the comments on 1 John 2:3-4.
The believer who practices righteousness, keeps (obeys) His commands and therefore keeps themselves “unstained by the world” (James 1:27) and its false standards devised from the “doctrines of demons” (1 Timothy 4:1).
On the other hand, John states in no uncertain terms that “anyone who does not practice righteousness is not of God.” This is not a proof passage for validating if someone else is genuinely saved, it just doesn’t fit the context. The emphasis is for believers to look inward to verify if they are obedient to His commands and are pursuing this life of faith from His standards of truth, which has its ultimate source “of God.” Therefore, by the phrase “of God,” John specifically desires to clarify that their failure to produce righteousness is the evidence of their disobedience and not that they are unbelievers.
He then advances the issue regarding “the one who does not love his brother,” asserting that this negative attitude towards other believers also does not have its source from God’s commands. For he has previously stated that he who “hates his brother is in the darkness”/“walks in the darkness” (1 John 2:9, 11) referring to the spiritual darkness of sinfulness. This is the mark of believers who fails to produce a righteous character within the Christian community and before the world.
The Final Thought
Are we certain that we are obedient children of God? Or do we imitate the unbeliever as children of the devil? The Apostle Paul advises us to “examine ourselves, not other believers:
Test yourselves to see if you are in the faith; examine yourselves! Or do you not recognize this about yourselves, that Jesus Christ is in you—unless indeed you fail the test? (2 Corinthians 13:5; cf. 2 Peter 1:10-11)
[1] Wuest, K. S. (1997). Wuest’s Word Studies from the Greek New Testament. Grand Rapids MI: Eerdmans, 13.113.
© 2025 David M. Rossi