In June and July 2018, Rev. Lou Ellen Hartley preached a series on the Great Ends of the Church, which may be found in the Book of Order, section F-1.0304, page 5 (page 41 of the PDF).
Proclamation of the Gospel for the Salvation of Humankind
The Shelter, Nurture, and Spiritual Fellowship of the Children of God
The Maintenance of Divine Worship
The Promotion of Social Righteousness