C.H. Spurgeon emphasizes that past deliverances from God should strengthen our faith in facing new challenges, as exemplified by David's confidence in the Lord's protection against Goliath. He reminds us that just as God delivered David from the lion and the bear, He will also deliver us from our current struggles. Spurgeon encourages believers to recall God's previous acts of kindness and to trust that He will not abandon us in our time of need. The sermon reassures us that God's faithfulness remains constant, and we should approach our fears with courage, knowing that God is always with us.