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How are Bible lesson-sermons used in Christian Science worship services?

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In Christian Science, the "Bible lesson-sermon" serves as the central element of both daily study and public worship. Designated by Mary Baker Eddy in 1895 as the church’s dual "pastor," the lesson-sermon consists of selected passages from the Bible and the denomination's foundational text, Science and Health with Key to the Scriptures.12

These lessons cover 26 specific subjects and provide the structure for the Sunday service. During these services, the lesson-sermon is read aloud by a first and a second reader who are elected by the local congregation. This practice reflects the denomination's unique approach to worship, which notably excludes traditional sacraments.1