“The Sunday School is the church organized to do the work of the Great Commission. All other organizations within the church (discipleship training, choirs, etc) recruit its people from those who are already part of the church fellowship. The Sunday School alone is the organization with the task of reaching people. Therefore, it is imperative the main objective for the Sunday School be reaching lost and unchurched people. We must have a heart for the Great Commission. If we do not, then not only will the Sunday School regress but so will the other organizations within the church which enlist those who have been brought in through the Sunday School ministry. Therefore, if the Sunday School does not reach people, then the whole church suffers.”
Allan Taylor, from his book The Six Core Values of Sunday School