A.W. Tozer emphasizes the necessity of inner illumination for Christians, urging believers to seek a deeper understanding of God's will beyond mere intellectual knowledge. He highlights Paul's prayer for the Colossians, which calls for spiritual wisdom and understanding to lead a fruitful life. Tozer warns against self-seeking, selfish possessions, and worldly attachments that hinder spiritual growth and illumination. He stresses that true illumination leads to a life that is pleasing to God and fruitful in good works. Ultimately, Tozer calls for a return to the gifts of the Spirit, particularly the gift of discernment, to navigate the complexities of faith and life.

C.H. Spurgeon emphasizes the goodness of light, which originates from God's command, 'Let there be light.' He urges believers to appreciate both physical and spiritual light, the latter being essential for understanding God's glory and our own sinful nature. Spurgeon highlights the necessity of distinguishing between light and darkness, encouraging Christians to live in a way that reflects their identity as children of light. He calls for a commitment to holiness and separation from the darkness of the world, seeking more of God's true light in their lives. Ultimately, he prays for Jesus to be the guiding light for believers.

Charles Finney emphasizes the necessity of spiritual illumination to truly understand the law of God, as expressed in Psalm 119:18. He explains that the term 'law' encompasses the entire revealed will of God, and the request to 'open mine eyes' signifies a plea for spiritual light to perceive the wonders within Scripture. Finney outlines the implications of this request, including the need for divine assistance to grasp spiritual truths and the transformative consequences of having one's eyes opened, which leads to a deeper understanding of oneself and God. He concludes that such illumination not only enriches personal faith but also sets believers apart from those who remain spiritually blind.

T. Austin-Sparks emphasizes the significance of spiritual illumination in understanding the Scriptures and experiencing true power in the Christian life, as demonstrated by the apostles on the day of Pentecost. He argues that while the New Testament is complete, the ongoing work of the Holy Spirit is essential for revealing its meaning and applying it to our lives. The apostles' transformation from confusion to clarity illustrates how illumination can release believers from spiritual bondage. Sparks highlights that true understanding comes not from mere intellectual grasp but from a divine revelation that empowers and transforms. He calls on believers to seek this illumination as a vital aspect of their faith journey.

A.B. Simpson emphasizes the role of the Holy Spirit as the Illuminator and Guide in our lives, highlighting how He provides the light of truth through the Scriptures and reveals God's will to us. The Holy Spirit not only enlightens our understanding but also gives us spiritual vision, allowing us to perceive divine realities and the hope of our calling in Christ. Simpson illustrates the importance of being led by the Spirit in our daily lives and decisions, asserting that true guidance comes from a surrendered spirit and a readiness to obey God's Word. He encourages believers to trust in the Holy Spirit's direction, even when circumstances seem contrary, and to rely on Him for effective service in sharing God's message.

John Gill emphasizes that claiming to be in the light of Christ while harboring hatred towards a brother is contradictory and reveals a state of darkness. He explains that true faith is inherently linked to love, and without love, one remains in spiritual ignorance and under the influence of darkness. Gill also addresses the misconception among some Jews that allows for hatred under certain circumstances, reinforcing that love must prevail among believers regardless of the situation. Ultimately, he asserts that genuine illumination by the Spirit of God must manifest in love for others.

A.W. Tozer emphasizes the necessity of the Holy Spirit in understanding and applying Scripture, warning against a purely intellectual approach to faith. He critiques churches that rely solely on the text without the transformative power of the Holy Spirit, advocating for a deeper, inward illumination that leads to genuine faith and regeneration. Tozer expresses a preference for small groups that experience this inner knowledge over larger congregations that may lack spiritual depth. He concludes with a prayer for the Holy Spirit's presence to fill believers, highlighting the importance of spiritual awakening in the life of the church.

John Bunyan emphasizes the significance of light in God's creation, illustrating how it parallels the spiritual illumination necessary for salvation. He explains that just as God commanded light to exist, the Holy Spirit first enlightens our understanding to reveal our true state, the consequences of sin, and the merits of Jesus Christ. This divine light allows us to grasp the faithfulness of God and the promises of the gospel. Bunyan draws connections between the creation of light and the transformative work of the Holy Spirit in our hearts, as seen in Paul's writings to the Corinthians.