(AI Generated Summary) This sermon explores the necessity of the new birth by examining the nature of the human heart, which is described as a complex entity comprising mind, affection, and will. The central argument posits that every person is inherently driven to seek happiness, and the direction of this pursuit determines one's spiritual trajectory. By citing examples such as Jesus, Moses, and early Christians, the message illustrates that true contentment is found only in obedience to God, whereas setting one's mind on the flesh leads to hostility toward God and ultimate death. The teaching concludes that because the natural heart is deceitful and unable to submit to God's law, regeneration is not optional but essential for seeing the kingdom of God and finding rest.