God doesn't stick to the job description; God apparently gets a kick out of playing hooky, breaking the rules, and shocking the universe out of its socks. God is unpredictable. Exceedingly unpredictable. . .
What seems like unpredictability is, from God's standpoint, something else: absolute freedom. . . .
This freedom is the ground of grace. God can be gracious precisely because God cannot be contained by our understanding, cannot be restrained by sin, cannot be thwarted by death, cannot be limited by principles of justice, cannot even be kept within the boundaries of deity.
— Donald McCullough, If Grace Is So Amazing, Why Don't We Like It?