Jamieson, Fausset & Brown, on Lam 3:39

“Mem. Why hath a living man murmured, man suffering for his sins?”

“living--and so having a time yet given him by God for repentance. If sin were punished as it deserves, life itself would be forfeited by the sinner. "Complaining" (murmuring) ill becomes him who enjoys such a favor as life (Pro 19:3). for the punishment of his sins--Instead of blaming God for his sufferings, he ought to recognize in them God's righteousness and the just rewards of his own sin.”

Imported from an open dataset — not yet checked against the printed edition.