How do we know God's work in salvation is good?

The Bible teaches that God's work of salvation is entirely reliant on His grace and mercy, not on human effort or righteousness. In Titus 3:4-6, we see that God saved us, 'not by works of righteousness which we have done, but according to his mercy.' This underscores that God's act of regeneration and His sustaining of believers is good because it comes from His nature. Moreover, Philippians 1:6 reassures us that the good work God begins in believers will be completed, reinforcing the notion that His work is always good. This is central to the hope of every believer and glorifies God as the ultimate source of salvation.