job 42:2 I know that thou canst do every thing, and that no thought can be withholden from thee. - Free Bible Online

      2. In the first clause he owns God to be omnipotent over nature, as contrasted with his own feebleness, which God had proved (Job 40:15; 41:34); in the second, that God is supremely just (which, in order to be governor of the world, He must needs be) in all His dealings, as contrasted with his own vileness (Job 42:6), and incompetence to deal with the wicked as a just judge (Job 40:8-14).
      thought--"purpose," as in Job 17:11; but it is usually applied to evil devices (Job 21:27; Ps 10:2): the ambiguous word is designedly chosen to express that, while to Job's finite view, God's plans seem bad, to the All-wise One they continue unhindered in their development, and will at last be seen to be as good as they are infinitely wise. No evil can emanate from the Parent of good (Jas 1:13, 17); but it is His prerogative to overrule evil to good.

JFB.