Lamentations 3:22–23 was written from inside Jerusalem's complete destruction — the worst possible circumstances, written by someone watching the consequences of corporate failure. The author does not explain or minimize. He holds onto one thing: "It is of the LORD's mercies that we are not consumed, because his compassions fail not. They are new every morning." The Hebrew chesed — mercies — is covenantal love, not sentiment. And it is described as new every morning — not depleted by yesterday's failure.
Proverbs 24:16 is one of the plainest verses about the relationship between righteousness and falling: "For a just man falleth seven times, and riseth up again." The mark of the just man in this verse is not that he does not fall — it is that he rises after falling. Relapse is a fall. The question is not whether the fall happened but whether the rising will.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.