D.L. Moody emphasizes the importance of remembrance in his sermon 'Son, Remember,' recounting his near-death experiences that brought his life memories rushing back. He reflects on how all forgotten things will eventually resurface, urging listeners to remember their sins and confess them before it's too late. Moody highlights biblical examples, such as Christ's warning to remember Lot's wife and God's reminders to the Israelites of their deliverance from Egypt, stressing that forgetting God's goodness can lead to dire consequences. The sermon serves as a call to acknowledge and reflect on one's life and relationship with God.