A.W. Tozer emphasizes that the truth of Christianity should not rely on external evidence or the achievements of notable individuals, but rather on the transformative power of the Holy Spirit. He argues that true New Testament Christianity is validated not by logic or human reasoning, but by the inner experience and guidance of the Holy Spirit in the believer's life. Tozer calls for believers to seek a deeper connection with the Holy Spirit, who reveals truth and empowers the Christian experience beyond mere intellectual assent.