The Eastern Orthodox Church affirms Romans 9:18-21 as expressing God's absolute sovereignty and predestination. God's will cannot be thwarted and His mercy flows according to His eternal knowledge and purpose. The passage establishes that God has the authority to choose and predestine according to His will. However, Orthodox theology maintains that God's predestination is not arbitrary but flows from His infinite wisdom and foreknowledge of all human choices. Human freedom is not denied but is understood as existing within the context of God's perfect knowledge. The apparent tension between divine omniscience and human freedom is accepted as a theological mystery that exceeds human rational categories. Both truths are affirmed as revealed in Scripture.