David Daniel emphasizes the concept of 'An Appointed Time' based on Ecclesiastes 3, illustrating that every aspect of life has its designated season, from birth to death, planting to harvesting, and joy to sorrow. He challenges the congregation to recognize the inevitability of their appointments, particularly the ultimate appointment with God, and to live purposefully within the seasons God has established. Daniel encourages believers to embrace the beauty of God's timing and to find joy in their labor as a gift from Him, while also acknowledging the reality of life's cycles and the importance of being prepared for the end. He concludes by reminding the audience that their actions during their lifetime will be accounted for, urging them to live for God's glory.