Why is it significant that salvation is God's work and not ours?

The fact that salvation is entirely God's work is fundamental to the Reformed understanding of grace. This belief aligns with the teachings of the Five Points of Dordrecht (TULIP), which include the total depravity of man, affirming that no human can contribute to their own salvation due to our sinful nature. Philippians 1:6 illustrates this by stating that He who began a good work in us will carry it to completion. This ensures that the glory for salvation belongs solely to God and alleviates the burden of performance from believers, allowing them to rest in His finished work at the cross, as echoed in Ephesians 1:4-5.