One of the top leaders of the Church of Jesus Christ of Latter-day Saints—the Mormons—has acknowledged that there have been times when church leaders and members have made mistakes. President Dieter Uchtdorf told a gathering last week that some Mormon leaders have said and done things that were “not in harmony with the church’s values, principles, or doctrine.” He did not specify what those things were. Some analysts said the speech signaled a significant change in tone for a church that has in the past clamped down on dissenters.