21. None can tell whence or where, seeing it, &c.
      fowls--The gift of divination was assigned by the heathen especially to birds. Their rapid flight heavenwards and keen sight originated the superstition. Job may allude to it. Not even the boasted divination of birds has an insight into it (Ec 10:20). But it may merely mean, as in Job 28:7, It escapes the eye of the most keen-sighted bird.

JFB.