R.A. Torrey emphasizes the critical role of thanksgiving in prayer, as highlighted in Philippians 4:6-7. He points out that while we often approach God with specific requests, we frequently neglect to express gratitude for the blessings we have already received. This ingratitude can hinder the power of our prayers, as God desires a thankful heart. Torrey encourages believers to reflect on past blessings to strengthen their faith and approach God with renewed boldness. He cites biblical examples of prayer warriors who were characterized by their thanksgiving, urging us to adopt this practice in our own prayer lives.