How do we know that salvation is a sovereign act of God?

According to John 5:21, Jesus states that just as the Father has the authority to raise the dead, so does the Son. This illustrates the sovereign nature of salvation, where God gives life to whom He will. In the context of Reformed theology, salvation is not based on human merit, but is a unilateral decision by God to extend grace to those He has chosen. Such an act showcases the depths of God’s mercy and underscores His ultimate authority over life and death, as expressed in Ephesians 2:1-5, where Paul affirms that believers are made alive when they were dead in trespasses.