How do we know that God's mercy coexists with His justice?

God's mercy does not negate His justice; rather, they coexist harmoniously. This is profoundly illustrated in the sacrifice of Jesus Christ, where God's justice was satisfied through Christ’s atonement for sin. As such, God's mercy is extended to the elect who realize their inability to earn favor and cling to Christ as their sole righteousness. The notion that God will overlook sin contradicts the very essence of His holy nature, which must punish sin, exemplifying the balance between mercy and justice in His redemptive plan.