Jesus said, “I am the Light of the world; he who follows Me will not walk in the darkness, but will have the Light of life” (John 8:12). And He also declared, “I have come as Light into the world, so that everyone who believes in Me will not remain in darkness” (John 12:46). When we trust in Christ as our Savior, God rescues us “from the domain of darkness” and transfers us “to the kingdom of His beloved Son” (Col 1:13). This domain of darkness refers to Satan’s kingdom, a spiritual realm in which the majority of this world live. When one hear abouts Christ and the good news of the gospel, it affords them the opportunity to “turn from darkness to light and from the dominion of Satan to God” (Acts 26:18). Writing to Christians in Ephesus, Paul said, “you were formerly darkness, but now you are light in the Lord; walk as children of light—for the fruit of the light consists in all goodness and righteousness and truth—trying to learn what is pleasing to the Lord” (Eph 5:8-10).
You were Formerly Darkness
Prior to our salvation, we not only walked in the darkness, but Paul said, “you were formerly darkness” (Eph 5:8a). Darkness (skotos) is used both literally and figuratively in the Bible. Luke used the term literally when Christ was on the cross, saying, “darkness fell over the whole land” (Luke 23:44). Here, darkness is the result of the absence of sunlight, either partial or complete. However, Jesus used the word when talking to the chief priests, officers, and elders (Luke 22:52), saying, “this hour and the power of darkness are yours” (Luke 22:53). The Jewish authorities were operating according to Satan’s agenda and were, therefore, his instruments of evil to crucify the Messiah. The power of darkness includes demonic forces that dominate and drive this world system. Paul referred to them as “the rulers, the powers, the world forces of this darkness, [and] the spiritual forces of wickedness in the heavenly places” (Eph 6:12).
Paul used the verb form of darkness (skotoō) when talking about the pagan mind, which he described as “being darkened in their understanding, excluded from the life of God because of the ignorance that is in them, because of the hardness of their heart” (Eph 4:18; cf. Rom 1:21). The darkened mind is one devoid of divine revelation, where any genuine thought of God is excluded (ignorance), and it is driven by negative volition (hardness of heart).
Ephesians 5:8, Paul used darkness as a metaphor for spiritual blindness, separation from God, and participation in sin (cf. John 3:19-20). Darkness is a state of being as well, a sphere of residence, and a way of thinking and living. According to Solomon, the wicked are those “who leave the paths of uprightness to walk in the ways of darkness; who delight in doing evil and rejoice in the perversity of evil; whose paths are crooked, and who are devious in their ways” (Prov 2:13-15).
Now You are Light in the Lord
Now that we are saved, we “are light in the Lord” (Eph 5:8b), a truth that reflects our new identity in Christ. In the New Testament, the term light (phōs) is used both literally and metaphorically. Literally, it refers to physical light, such as the light of a lamp or the sun (Matt 5:15; Acts 12:7). Metaphorically, it symbolizes truth, holiness, life, and the presence of God. Jesus is described as the “Light of the world” (John 8:12), signifying His role as the revelation of God and the source of spiritual life.
The prepositional phrase “in the Lord” (en kuriō) denotes sphere or position and highlights our identity with Christ. Positional truth is distinct from experiential truth. But without positional truth, experiential truth would be impossible. By way of analogy, I am an American citizen, which speaks to my identity as a citizen of my country. My citizenship is a fixed reality that provides me with certain rights and privileges, as well as the responsibility to live as a good citizen. A noncitizen, by contrast, cannot enjoy the benefits that come with this status. Just as I cannot live as a good citizen of my country without first being a citizen, I cannot live the Christian life without first being in Christ. My identity in Christ—positional truth—forms the unchanging basis for my spiritual life, enabling me to live as God intends and to enjoy the blessings of salvation, blessings that an unbeliever cannot experience. Our position as light in the Lord brings a responsibility to reflect that light in our daily conduct. This means our performance—how we think, speak, and act—should align with our position in Christ. To walk as children of light is to live in a manner consistent with our new nature. This includes rejecting the deeds of darkness, such as immorality, greed, and deceit (Eph 5:3-7).
Walk as Children of Light
To us who are in Christ, Paul writes, “walk as children of light” (Eph 5:8c). This is the Lord’s will for us. The directive assumes we can walk in darkness, otherwise it’s an unnecessary command. The word walk translates the Greek verb peripateō, which is used here as a metaphor for how we live. The verb is in the active voice, present tense, and imperative mood. The active voice means we have the responsibility to act as God directs, and the present tense refers to habitual conduct, and the imperative mood means it’s a command to be obeyed. To walk as children of light means living transparently before God who sees all we think, say, and do. It also means we live in way that reflects His glory for others to see, and we seek to bring others to God through Christ and His Word that they might know and walk with the Lord too. But those who love the darkness (John 3:19)—and they are the majority of humanity—will avoid spiritual Christians because our values and lifestyle reveal the darkness of their hearts and lives, and they want nothing to do with us and will avoid biblical conversation and fellowship at all costs, even resorting to violence when they feel threatened.
The Fruit of the Light
Paul does not leave us guessing as to what the production of our walk with the Lord should look like, as he states, “for the fruit of the Light consists in all goodness and righteousness and truth” (Eph 5:9). The fruit refers to the qualities that are seen in God Himself (Gal 5:22-23), and when we are filled with the Spirit (Eph 5:15), and walk in the Spirit (Gal 5:16), the Light within us will shine forth and bear fruit for others to see. This requires us to walk in fellowship with God, to “walk in the Light as He Himself is in the Light” (1 John 1:7), which means submitting to Him (Jam 4:7) and walking by faith (2 Cor 5:7) as obedient-to-the-Word believers. But if we “walk in the darkness” (1 John 1:6), which is always a possibility for the Christian, there will be nothing noticeable to distinguish us from an unbeliever who lives in perpetual carnality (1 Cor 3:1-3).
Goodness (agathōsunē) connotes generosity in one’s dealings with others and reflects God’s generosity toward us as His children. It speaks of moral excellence that seeks God’s best in the lives of others by means of prayer, good works, and a heart of grace that is open handed toward the needy.
Righteousness (dikaiosunē) denotes conformity to a moral standard. Here, it speaks of the life that is rightly aligned with God’s character and Word. It is the life that is walking by faith in God’s Word and doing right in His sight, and such a life is manifest for others to see. Those who are positive to God and love His Word will celebrate the life that is in conformity with the Lord, and those who are negative to God and love evil will despise it.
Truth (alētheia) denotes genuineness and honesty. It refers to what is real and actual rather than what is false. Truth is the basis for making sense of what is, and abiding by right actions rather than living by lies and deception. It refers both to speech and conduct that is aligned with God and His Word.
Goodness and righteousness and truth were qualities of King Hezekiah, of whom it is written, “Hezekiah did throughout all Judah; and he did what was good, right and true before the LORD his God. Every work which he began in the service of the house of God in law and in commandment, seeking his God, he did with all his heart and prospered” (2 Ch 31:20-21).
Trying to Learn What is Pleasing to the Lord
Those of us who learn and live God’s Word on a regular basis are “trying to learn what is pleasing to the Lord” (Eph 5:10). There’s only one way to live a life that is pleasing to the Lord, and that is to learn His Word and walk by faith (2 Cor 5:7; Heb 10:38). God has revealed Himself and His will through His written Word, and when we devote ourselves to the daily study of Scripture, we come to know what pleases the Lord. Every thought, word, and deed must be measured by the Word God as it speaks to our conversations, friendships, resources, work ethic, and every aspect of life. When we yield our lives to God and walk by faith in obedience to His Word, we know that it pleases Him, for “without faith it is impossible to please Him” (Heb 11:6).
Light refers to the production of our lives, the good works we produce when filled with the Spirit (Eph 5:18), and walking with God (Gal 5:16). Jesus said to His disciples, “Let your light shine before men in such a way that they may see your good works, and glorify your Father who is in heaven” (Matt 5:16). It also speaks to our relationships, as we are instructed, “Do not be bound together with unbelievers; for what partnership have righteousness and lawlessness, or what fellowship has light with darkness?” (2 Cor 6:14).
Believer Beware
Christians should know there is a pseudo-light that deceives the ignorant, immature, and arrogant believer. Scripture reveals that “Satan disguises himself as an angel of light” (2 Cor 11:14) and that “his servants also disguise themselves as servants of righteousness” (2 Cor 11:15). This is a warning to Christians. Satan, described elsewhere as the “god of this world” who blinds the minds of unbelievers (2 Cor 4:4), operates through cunning and deceit. His ability to “disguise himself as an angel of light” illustrates his strategy of imitating what is good, righteous, and truthful to mislead others. The imagery of an angel of light conveys the idea that Satan’s deceptions often appear attractive, virtuous, and even spiritually legitimate, making them particularly dangerous. His goal is to distort God’s truth and lead people away from the genuine light of Christ, who is the true source of spiritual life and truth (John 8:12).
Similarly, Paul states that Satan’s servants “disguise themselves as servants of righteousness” (2 Cor 11:15). These individuals, whether false teachers or other agents of deception, cloak themselves in the appearance of godliness to gain credibility and influence. They may teach partial truths, use Scripture out of context, or adopt the language of righteousness while ultimately promoting doctrines or practices that lead people astray. Paul reveals the end of such individuals, saying, “Their end will be according to their deeds” (2 Cor 11:15). We must judge the root by the fruit (Matt 7:21-23). But to the degree Christians are ignorant of God’s Word, we are vulnerable to Satan’s influences, and the key to detecting them is through learning God’s Word, and the key to avoiding his traps is through living God’s Word.
In conclusion, as Christians, we are called to walk in the light, reflecting the truth, goodness, and righteousness that characterize our new identity in Christ. God has “rescued us from the domain of darkness, and transferred us to the kingdom of His beloved Son” (Col 1:13), where we are regenerated (1 Pet 1:3), indwelt by the Holy Spirit (1 Cor 3:16), baptized into union with Christ (1 Cor 12:13), sealed for the day of redemption (Eph 1:13; 4:30). Our new position comes with spiritual blessings that enable us to live spiritually pleasing lives (Rom 6:11-13). Our Christian walk requires a commitment to studying God’s Word (2 Tim 2:15; 1 Pet 2:2), being filled with the Spirit (Eph 5:18), walking in the Spirit (Gal 5:16), and living by faith (2 Cor 5:17; Jam 1:22). This life will naturally bear fruit that honors God and serves as a witness to others. However, we must remain vigilant against false lights, as Satan seeks to deceive with imitations of righteousness. By walking in the light, we fulfill our calling as children of God, bearing testimony to the world of His saving power.
Dr. Steven R. Cook
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