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What is the Bible lesson-sermon in Christian Science?

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In Christian Science, the "Bible lesson-sermon" serves as the central element of both daily study and the Sunday church service.1

Designated by the church's founder, Mary Baker Eddy, in 1895, the lesson-sermon functions as the denomination's dual "pastor". It consists of selected passages from the Bible and the church's primary textbook, Science and Health, organized around 26 specific subjects.1

During Sunday services, this lesson is read aloud by two elected members of the congregation, known as the first and second readers. Because the lesson-sermon acts as the pastor, these services do not include traditional sacraments.1