Why do some people believe and others do not?

The differing responses to the gospel can be understood through the lens of God's sovereignty in election. According to Romans 9:16, it is not dependent on human desire or effort, but on God's mercy. Similarly, in John 10:26, Jesus states that His sheep hear His voice and follow Him, indicating that God distinguishes between those who belong to Him and those who do not. This truth affirms that God’s grace is at the heart of salvation, and it is only through His divine will and choice that any come to faith, emphasizing the grace-filled nature of our salvation.