A.W. Tozer emphasizes the profound blessings found in prayer, discussing both its subjective and objective aspects. He explains that prayer not only calms and inspires the individual but also has the power to effect real change in the world when aligned with God's will. Tozer warns against viewing prayer as a mere substitute for obedience, stressing that true prayer engages God and requires a clean heart and right motives. He illustrates the importance of prayer through biblical examples and personal anecdotes, ultimately calling believers to recognize prayer as the greatest privilege and responsibility bestowed upon them. The sermon concludes with a challenge to evaluate one's prayer life and commitment to God.