Jamieson, Fausset and Brown on Job 1:22

22. nor charged God foolishly--rather, "allowed himself to commit no folly against God" [Umbreit]. Job 2:10 proves that this is the meaning. Not as Margin "attributed no folly to God." Hasty words against God, though natural in the bitterness of grief, are folly; literally, an "insipid, unsavory" thing (Job 6:6; Jr 23:13, Margin). Folly in Scripture is continually equivalent to wickedness. For when man sins, it is himself, not God, whom he injures (Pr 8:36). We are to submit to trials, not because we see the reasons for them, nor yet as though they were matters of chance, but because God wills them, and has a right to send them, and has His own good reasons in sending them.