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.