Temple worship has changed in important ways since the 1830s. In Kirtland, Joseph Smith promised the Saints power from on high to preach the gospel and revealed washing and anointing rituals. By Nauvoo, his vision had grown, resulting in a temple endowment that constructed heaven on earth—ritually declaring men and women the celestial kings and queens from John’s vision in Revelation. Later leaders followed Joseph’s precedent of change, from Brigham Young’s adjustments to President Russell M. Nelson’s focus on Christ-centered covenants. In this interview, historian Jonathan Stapley discusses his book, Holiness to the Lord: Latter-day Saint Temple Worship.