Charles Ellicott Commentary Lamentations 3:31

"For the Lord will not cast off for ever." — Lamentations 3:31 (ASV)

For the Lord ... —The counsels of submission are followed by the grounds of hope. The first, a quotation from Psalm 77:7, had been previously a favourite thought of the writer's (Jeremiah 3:5; Jeremiah 3:12). The second (Lamentations 3:32) rests on the fact that compassion underlies chastisement (Psalms 30:5; Job 5:18; Isaiah 54:8); the third (Lamentations 3:33) on the truth that the primary eternal will of God is on the side of love, and that punishment is, as it were, against that will.