This 30-day devotional study guide is based on Ellen G. White’s The Great Controversy, Chapter 23, “What Is the Sanctuary?” It invites readers to take a deeper journey into the biblical teaching of Christ’s ministry in the heavenly sanctuary, the meaning of Daniel 8:14, and the cleansing of the sanctuary.

Each day focuses on a key spiritual truth, beginning with the foundation of the Advent faith and moving through themes of disappointment, prophecy, Christ as Messiah, the earthly and heavenly sanctuary, the Day of Atonement, the investigative judgment, repentance, forgiveness, and preparation for the soon return of Jesus.

This devotional is designed not only to explain doctrine, but to lead readers into a closer personal walk with Christ. Through Scripture readings, thoughtful reflections, study questions, practical applications, and daily prayers, readers are encouraged to examine their hearts, trust in Jesus as their High Priest, and allow Him to do His cleansing work within them.

The sanctuary message reveals Jesus as our Sacrifice, High Priest, Advocate, Mediator, Judge, and soon-coming King. It reminds us that heaven is actively working for our salvation and that Christ is preparing a people to stand faithfully in these last days.

This study guide is ideal for personal devotion and family worship or prayer groups. Over 30 days, readers are invited to prayerfully reflect on the great question: Am I allowing Christ to cleanse the sanctuary of my heart?