C.H. Spurgeon emphasizes that God can empower us to be strong in our faith and service, as illustrated by the struggles of King Asa and Judah. Despite their weaknesses, they were reminded that God would support them if they remained faithful, contrasting their situation with the consequences faced by those who forsook Him. Spurgeon encourages believers to serve God with full commitment, asserting that true diligence in His work leads to divine rewards. He highlights that halfhearted efforts yield no results, while wholehearted dedication brings prosperity and fulfillment. The sermon serves as a reminder that even in challenging times, we can trust in God's strength to guide us safely through.