Why is it important to preach the old gospel?

The sermon highlights that Isaac dug up the wells that had been stopped by the Philistines as a metaphor for maintaining the purity of the gospel message. Just like Isaac sought to restore those wells, Christians today must adhere to the proclamation of the gospel as it has been historically taught. The old gospel emphasizes Christ's redemptive work, and any deviation or addition clogs the well, leading to spiritual drought. It is crucial because the gospel is the only means God uses to save sinners. Keeping to the old paths preserves the integrity of the faith and ensures believers receive the spiritual nourishment needed for growth, as outlined in 1 Corinthians 1:21, which states that God chose the foolishness of preaching to save those who believe.