Justice is getting what we deserve.
Mercy is NOT getting what we deserve.
Justice is administered equally in each case by the entity required to enforce the law.
Mercy is extended by the one violated. It may be extended to one and not another as the one violated determines.
Injustice is hated by our Lord. Those who administer injustice will be dealt with harshly in The Judgment.
Mercy is loved by our Lord. Grace is the result of His mercy. However, His mercy is extended conditionally.
➛ those who come to Him enter into His rest
➛ those who reject Christ Jesus do not receive His mercy