R.A. Torrey emphasizes the mission of the seventy disciples as a model for modern Christian workers, highlighting the importance of prayer and the urgency of the harvest. He discusses the necessity of being sent by Christ, the challenges of going forth as 'lambs among wolves,' and the need for workers to travel light and focus on their mission. Torrey also reflects on the consequences of rejecting Christ's message, illustrating the greater guilt of cities that have witnessed His works yet remain unrepentant. The sermon calls for a commitment to prayer and action in the face of a great spiritual need, urging believers to recognize their role in God's harvest.