How do we know God chooses whom to save?

Ephesians 1:4-5 states that God chose us in Christ before the foundation of the world, affirming that salvation is rooted in God's sovereign plan rather than human decision. Similarly, John 1:13 emphasizes that those who are born again are not born of the will of the flesh or of man, but by the will of God. This reflects the Reformed understanding that God’s grace is irresistible and that He calls those He has chosen to salvation. The parable of the prodigal son illustrates this divine choice where the son, though a rebel, is drawn back home by the Father’s loving initiation, demonstrating that it is God who causes the willingness to return.