R.A. Torrey emphasizes the joy and authority given to the seventy disciples as they return from their mission, highlighting the power of Jesus' name over evil and the assurance of their names being written in heaven. He explains that true wisdom and revelation come from God, not from human understanding, and that Jesus has been given all authority in heaven and earth. Torrey encourages believers to recognize their privileged position in knowing God and to accept Jesus' invitation to find rest for their souls through His easy yoke. The sermon underscores the importance of humility and reliance on Christ for spiritual strength and understanding.