In his sermon, Derek highlights the story of Cain and Abel from Genesis, emphasizing the significance of offering to God. He contrasts Abel's heartfelt sacrifice with Cain's lackluster presentation, illustrating that true offerings stem from the heart and involve genuine faith and sacrifice. Derek argues that our offerings should reflect gratitude for what God has done in our lives, prioritizing the best and most costly aspects of our lives for Him. Ultimately, he reminds the congregation that real faith manifests in a willingness to give sacrificially, acknowledging God's worthiness in every aspect of life.