Leonard Ravenhill emphasizes the profound depth of the Gospel of John, particularly focusing on the themes of sanctification and the nature of Jesus as both divine and human. He argues that the Gospel is not merely a collection of four accounts but a singular narrative revealing the essence of Christ. Ravenhill highlights the importance of understanding Jesus' prayer in John 17, which he considers a sacred moment that showcases the need for believers to seek wisdom and sanctification in their lives. He challenges the church to move beyond superficial spirituality and to embrace a deeper relationship with God, emphasizing the necessity of separation from worldly influences. Ultimately, he calls for a commitment to holiness and a deeper understanding of God's majesty.