When man does not heed warnings of the night, he is chastened, etc. The new thought suggested by Elihu is that affliction is disciplinary (Job 36:10); for the good of the godly.
multitude - so the Margin, Hebrew (Keri). Better with the text (Chetib), “And with the perpetual (strong) contest of his bones”; the never-resting fever in his bones (Psa 38:3) [Umbreit].