T. Austin-Sparks emphasizes the importance of resting in the Lord's care, as expressed in 1 Peter, where the Apostle Peter reassures believers of God's watchful eye and attentive ear towards the righteous. He encourages Christians to cast their anxieties upon the Lord, highlighting that this act is a deliberate and faithful response to God's concern for us. Sparks clarifies that while we are called to be responsible and diligent, we must not let anxiety distract us from our faith and duties. He reminds us that true carefreeness comes from trusting God with our worries, especially in times of distress. Ultimately, the sermon calls believers to recognize God's active involvement in their lives and to respond with faith and peace.