How do we know that God saves sinners through grace?

The crux of sovereign grace theology is that salvation is by grace alone, rooted in God's mercy. As articulated in Ephesians 2:8-9, 'For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: Not of works, lest any man should boast.' This underscores that salvation is entirely the work of God. The healing of the deaf and dumb man serves as an illustration of this grace; he did nothing to earn his healing, just as we do nothing to earn our salvation. God's choice to save is based on His will and purposes, not on any personal merit.