How do we know that true salvation is a supernatural miracle?

The doctrine of salvation asserts that it is a miraculous work of God alone. Ephesians 2 clearly illustrates this by stating that those who are saved are 'quickened' or made alive by God, highlighting that salvation is not a cooperative endeavor between God and man. The narrative emphasizes that just as Christ raised the dead, God must bring individuals to spiritual life through His mighty power. This understanding is reinforced by Hebrews 4, which affirms that the Word of God is alive and active, serving as the instrument through which God breathes life into the spiritually dead, revealing His sovereign grace in salvation.