A.W. Tozer emphasizes that mere revelation of truth is insufficient without the illumination of the Holy Spirit. He critiques the belief that intellectual understanding of scripture equates to spiritual truth, arguing that true knowledge of God requires a willing heart to obey His will. Tozer highlights the distinction between evangelical rationalists, who rely solely on the text, and evangelical mystics, who seek a deeper spiritual connection. He asserts that only through obedience and a prepared heart can one truly know the soul of truth, which leads to genuine transformation and revival in the believer's life.