T. Austin-Sparks emphasizes that true consecration to God involves becoming a sign of His wisdom and power to the world. He illustrates that just as Moses was a sign to the Israelites, believers today are called to embody God's message and purpose, even at great personal cost. The sermon challenges listeners to embrace their role as signs, reflecting God's glory and truth in a world that often ridicules such commitment. Sparks encourages a deep, personal surrender to God, suggesting that through this, believers can reveal His nature to both humanity and the spiritual realm. Ultimately, he calls for a fresh act of abandonment to God, promising that such a commitment will lead to a profound revelation of His presence.