Octavius Winslow emphasizes the necessity of human effort in conjunction with divine blessing, illustrating that while God provides the power, we must actively engage in the means He has ordained. He uses the metaphor of digging ditches to represent our spiritual preparation through prayer, study of the Word, and participation in the community of faith. Winslow encourages believers to recognize their role in seeking God's grace, particularly through trials and afflictions, which can deepen our reliance on Him. The sermon highlights that our spiritual vitality is directly linked to our active pursuit of God and His means of grace. Ultimately, the message is one of hope, urging believers to expect and ask for God's abundant blessings.