In John 1:9, the apostle John gives a foundational statement about the identity and mission of Jesus: 'That was the true Light, which lighteth every man that cometh into the world.' Here, 'true' (Greek: ἀληθινός, alēthinos) means genuine or ultimate, distinguishing Christ from lesser lights (prophets, sages) by declaring Him the perfect revelation of God (cf. John 8:12; Hebrews 1:1-3). The 'Light' (Greek: φῶς, phōs) is a frequent Johannine metaphor for divine truth, purity, and life itself (see John 1:4–5). The phrase 'lighteth every man' asserts Christ’s universal revelatory role. While not referring to universal salvation, it signals that Jesus is the only source of spiritual understanding for all people groups—Jews and Gentiles (cf. Isaiah 49:6 [https://www.chabad.org/library/biblecdo/aid/15941/jewish/Chapter-49.htm], prophesying the Messiah as a 'light to the nations'). Theologically, this speaks to Christ’s work in both creation (giving physical life and rationality, Genesis 1:3 [https://www.chabad.org/library/biblecdo/aid/8168/jewish/Chapter-1.htm]) and in new creation (offering rebirth and spiritual light; 2 Corinthians 4:6 [https://www.biblegateway.com/passage/?search=2+Corinthians+4%3A6&version=KJV]). In Reformed theology, it is often distinguished between 'external' illumination, given to all through general revelation, and 'internal' illumination which saves, given by the Holy Spirit. Ultimately, John 1:9 encapsulates the unique and universal claims of Christ’s divinity, linking Him as Creator, Sustainer, and Redeemer—core of traditional, confessional Christianity.