God's justice is certain because it is an inherent part of His unchanging nature, ensuring that all sin is punished.
The certainty of God's justice comes from His nature as perfectly just and righteous. Ezekiel 18:4 states, 'The soul that sinneth, it shall die,' which emphasizes that God will not overlook any sin. Justice is not arbitrary; it is a reflection of God's character. When we see Adam's transgression and the consequent banishment, we understand that God's justice requires that every sin is accounted for. This permanence in God's justice assures us that He will uphold His commandments and that mercy is granted only through Christ, who bears our sins and punishment on the cross.
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