The Presbyterian Church (USA) has its roots in the teachings of Protestant Reformers John Calvin and John Knox. Some of the Reformed Principles upon which the PCUSA was founded include the emphasis on the Sovereignty of God, the authority of Scripture, the priesthood of all believers, and election (God's choosing) of people for salvation and service. Grace alone, faith alone, and Scripture alone are phrases used to define the Reformation period, and have highly influenced our faith as Presbyterians. The grace of God figures prominently in the PCUSA. We emphasize Scripture's promise that we are "saved by grace through faith." This means that there is nothing we can do save ourselves. God has done it for us through his Son, Jesus Christ. We respond to God's action on our behalf with trust and faith in our Lord and Savior, as we seek to be obedient to God's will as revealed through Scripture. "God acts and we respond" orders all that we do as Presbyterian Christians.