Everyone who goes on ahead and does not abide in the teaching of Christ, does not have God. Whoever abides in the teaching has both the Father and the Son. (2 John 9, ESV)
Jesus said, “If you abide in my word, you are truly my disciples” (Jno. 8:31). The apostle John reiterates this truth in today’s verse. We cannot go beyond what the teaching of Christ says without forfeiting fellowship with God. The reason is clear: God’s word is truth (Jno. 17:17). God does not sanction error, which is a lie against the truth (and God cannot lie, Titus 1:2). Jesus promises He and the Father will “make our home” with the person who loves Him and keeps His word (Jno. 14:23). John’s statement agrees with this. If you truly want to have a relationship with Jesus, then love Him, keep His word and do not go beyond it. Live by faith according to His truth, and Christ will live in you (Eph. 3:17).
8 For you were once darkness, but now you are light in the Lord. Walk as children of light 9 (for the fruit of the Spirit is in all goodness, righteousness, and truth), 10 finding out what is acceptable to the Lord. 11 And have no fellowship with the unfruitful works of darkness, but rather expose them. 12 For it is shameful even to speak of those things which are done by them in secret. 13 But all things that are exposed are made manifest by the light, for whatever makes manifest is light. (Ephesians 5:8-13)
Christians are “light in the Lord”. We do not live in the shadowy recesses of sin and shame. This passages calls us to the following actions: 1) Walk as children of light. Goodness, righteousness and truth are “acceptable to the Lord” and is the fruit our life must bear. 2) Have no fellowship with sin. To practice, teach, endorse or otherwise approve of sin and those who practice it puts one in fellowship with sin. 3) Reprove the works of darkness (sin). That is, expose sin for what it is; shameful before God and those who love God. Do not approve it. Do not be entertained by it. Do not compromise with it. Stand up against sin and call the lost to repentance. You were once in sin’s darkness, too. Now, you are a child of light. Live like it every day.