12.  Who can discern the nature of the birds of the air?  How some carry with them a voice of melody, and others are variegated with all manner of painting on their wings, and others fly up into mid air and float motionless, as the hawk:  for by the Divine command the hawk spreadeth out his wings and floateth motionless, looking towards the south Ib. xxxix. 26..  What man can behold the eagle’s lofty flight?  If then thou canst not discern the soaring of the most senseless of the birds, how wouldest thou understand the Maker of all?