What does the Bible say about salvation according to mercy?

The Apostle Paul clearly emphasizes in Titus 3:5 that our salvation is not based on any works of righteousness that we have done but solely on God's mercy. We, by nature, are disobedient, foolish, and enslaved to sin, but God, in His kindness and love, intervenes. This divine mercy is necessary because no man can justify himself before God without the grace that comes from Him. The sheer act of being saved is a testament to God's sovereignty and grace, making salvation a work that relies entirely on Him, not on our human efforts or merit.