Job 5:3 - Ellicott's Commentary On The Whole Bible

I cursed. — The word means, “I was able to declare distinctly, and I did declare without hesitation, that his lot would be as follows.” All these general results of experience have the sting of insinuation in them that they contain the key to Job’s unfortunate condition. There is secret unsoundness there which is the cause of the manifest and open misery. It is impossible that a man so stricken should be otherwise than, for some unknown reason, the guilty victim of the righteous wrath of a just judge.