How do we know that God is engaged in man's salvation?

The involvement of the Trinity in the plan of salvation is compellingly outlined in Scripture. Ephesians 1:3-4 affirms that God the Father chooses those who will be saved, establishing the foundation of election before the foundation of the world. This reveals that salvation originates in the will of God the Father. Meanwhile, redemption is chiefly ascribed to God the Son, who through His sacrificial death on the cross paid the penalty for sin, as articulated in Galatians 4:4-5. Finally, God the Holy Spirit plays an essential role in applying salvation to believers by quickening the dead souls that the Father has chosen and the Son has redeemed (Ephesians 2:1). The Holy Spirit’s vital work includes instilling faith in those who are spiritually dead, demonstrating that every person of the Trinity cooperatively works for man's salvation.