Why is having a single heart important for Christians?

A single heart—a heart wholly dedicated to God—is crucial for true worship. Spurgeon warns against the perils of a divided heart, which can lead to empty prayers and spiritual stagnation. When our affections are split between God and sin, our spiritual lives become like a boat whose oars are pulling in different directions, resulting in circular folly. To genuinely seek God and find Him, we must resolve to serve Him alone, and this requires the full engagement of our hearts in both prayer and obedience to His will.