The central message of this sermon is that Satan's rebellion against God was fueled by ingratitude, specifically his refusal to acknowledge and appreciate the excellence of God, despite being a close and privileged being in creation. Through Satan's biography, the sermon illustrates how his rejection of gratitude led to a self-destructive and irrational choice, which ultimately resulted in his downfall. The sermon advances the belief that gratitude is a fundamental aspect of the character of God and His creation, and that it is essential for experiencing the blessings of life and appreciating the good things we have received. The takeaway from this sermon is that ingratitude is a choice that can lead to spiritual destruction, and that cultivating gratitude is crucial for developing a right relationship with God and others.