God makes it crystal clear that He is holy and just. In Him there is no darkness. He makes it even clearer that He is merciful. Throughout His Word, He speaks of and shows off His great hatred of disobedience, sin, and waywardness. Simultaneously, He speaks of and shows off His willingness and great desire to forgive, restore, and love those He calls His own.
Our part is believing these two truths regarding the nature of God. Believing in God’s wrath necessarily leads to fear, but “perfect love casts out fear. For fear has to do with punishment, and whoever fears has not been perfected in love.” (1 John 4:18) Our fear is rather awe of God, a marveling of God’s ability to “forgive the iniquity of Your people; You cover all their sin. You withdraw all Your wrath; You turn from Your hot anger.” (Psalm 85:2-3) “Steadfast love and faithfulness meet; righteousness and peace kiss each other. Faithfulness springs up from the ground, and righteousness looks down from the sky.” (Psalm 85:11)
Jesus proclaims, “Those who are well have no need of a physician, but those who are sick. I have not come to call the righteous but sinners to repentance.” (Luke 5:31-32) “But that you may know that the Son of Man has authority on earth to forgive sins; I say to you, rise, pick up your bed and go home.” (Luke 5:24)
“If we confess our sins, [You] are faithful and just to forgive us our sins and to cleanse us from all unrighteousness.” “For You, O Lord, are good and forgiving, abounding in steadfast love to all who call upon You.”