The Harvest Call Newsletter is published by the Session of South Austin Presbyterian Church as its call to prayer for the works of the NAPARC Reformed and Presbyterian churches around the world.  Harvest Call Newsletter recognizes that the OPC shares a common system of doctrine with the churches with whom she OPC has ecclesiastical relations.  This doctrine is set out in the Reformed and Presbyterian confessions, and proclaims the unity of the Christian Church across borders, lands, and oceans.

The Reformed faith extols the common and ordinary means of grace, and the work of men who labor faithfully to bring the good news of Jesus Christ to the nations.