D.L. Moody shares a personal childhood experience of chasing his shadow, illustrating how pursuing the light of God brings peace and joy, while turning away leads to darkness. He emphasizes that just as his shadow followed him when he faced the sun, the Son of Righteousness will accompany those who seek Him. Moody encourages listeners not to doubt God's forgiveness, asserting that it is their own will that prevents them from receiving it. The sermon calls for a turn towards God's light to experience His love and grace.