The purpose of the Sabbath School is to make disciples for Christ. It includes the nurture of spiritual growth in members and prospective members, as well as the unchurched who come to join in the fellowship, study, sharing and service.
The Sabbath School exists not only to minister to its members, but to train those members to minister to others. The Sabbath School is a school of Christian living, not just an event on Sabbath mornings. It can include Bible study groups that meet at other times also. Its purpose is evangelistic, not ritualistic.