F.B. Meyer emphasizes the transformative reign of King Josiah, who undertook a thorough cleansing of idolatry and sin from the land, leading to a Passover celebration unlike any seen before. He highlights the necessity of self-examination and purging of inconsistencies in our lives to fully enjoy our relationship with God. Meyer encourages believers to regularly revisit the Scriptures, allowing God's truth to illuminate and refine their lives, much like Josiah rediscovered the neglected Book of the Law. The sermon calls for a renewed devotion to God's will as the ultimate standard for living, urging believers to immerse themselves in the Word for spiritual rejuvenation.