“13For he shall have judgment without mercy, that hath shewed no mercy; and mercy rejoiceth against judgment.”
Jesus says if you can’t or won’t forgive those who’ve wronged you, then neither will God forgive you for the wrongs you’ve done against Him. If you can’t or won’t show mercy to your enemies, then God will not show you His mercy. Judgment without mercy ought to terrify your heart. Mercy without judgment ought to cause your heart to rejoice.
Jesus does not come to earth to judge; rather He comes to earth to show mercy. Since He is God, and we are not; it only follows we should not judge.