John Gill Commentary Lamentations 3:32

"For though he cause grief, yet will he have compassion according to the multitude of his lovingkindnesses." — Lamentations 3:32 (ASV)

But though he cause grief
As he sometimes does in his own people; by convincing them of sin, and producing in them godly sorrow, which works repentance unto life, not to be repented of; by correcting and chastising them for it, and by hiding his face from them; all which are grievous to them:

yet will he have compassion according to the multitude of his mercies ;
his mercies are many, both temporal and spiritual, and his compassion is answerable; which he shows to his people by an application of pardoning grace, through the blood of Christ, by sympathizing with them under their afflictions, and delivering from them; by granting them his gracious presence, and restoring to them the joys of his salvation; all which is not according to their merits, but his mercies.