The author’s life is difficult. He is dealing with a personal enemy and all the people who follow that enemy. The whole city is drenched in wickedness and injustice. It lays heavily upon the author. Different emotions take hold of him, for example, despair, worry, but also trust in the Lord. He expects justice from his God. He teaches the readers and listeners a lesson: place your burdens before the Lord; he will support you. Yes, he will ensure that the righteous person will not fall. Other passages support this, for example, Psalm 37:5, which reads, Commit your way to the Lord; trust in him, and he will act.
1 Peter 5:7 is the citation of Psalm 37:5. Luther also said, God allows his children to sink (deep), but he does not let them drown
(i.e., die, or fall astray from God). Corrie Ten Boom, a woman who was part of the resistance during World War II, used the image of the suitcase of burdens.
Such a suitcase filled with burdens must be left before God, and not taken along. Also note how Jesus handles it when he encounters hostilities. He leaves justice with God. How many burdens didn’t he carry: misjudgment, enmity, trick questions, and in the last part of his life—flogging, a false judgment, mockery, and crucifixion. What a festive blessing that he took our place, and that we know, through this Guarantor, in faith, we are always safe with God.
22 Cast your burden on the LORD, and he will sustain you; he will never permit the righteous to be moved.