A.W. Pink explores the concept of 'Spiritual Fluctuations,' emphasizing that true Christians experience significant changes in their spiritual lives, contrasting with those who maintain a steady, unchanging faith. He argues that while many may envy a uniform spiritual experience, such stability can often lack genuine depth and the fear of God. Pink highlights the various changes believers face in their struggles with sin, their enjoyment of Scripture, their faith, prayer life, and external circumstances, suggesting that these fluctuations are essential for spiritual growth and humility before God. Ultimately, he asserts that the trials and changes in a believer's life serve to deepen their relationship with God and enhance their piety.