5.  But some one will say, If the Divine substance is incomprehensible, why then dost thou discourse of these things?  So then, because I cannot drink up all the river, am I not even to take in moderation what is expedient for me?  Because with eyes so constituted as mine I cannot take in all the sun, am I not even to look upon him enough to satisfy my wants?  Or again, because I have entered into a great garden, and cannot eat all the supply of fruits, wouldst thou have me go away altogether hungry?  I praise and glorify Him that made us; for it is a divine command which saith, Let every breath praise the Lord Ps. cl. 6..  I am attempting now to glorify the Lord, but not to describe Him, knowing nevertheless that I shall fall short of glorifying Him worthily, yet deeming it a work of piety even to attempt it at all.  For the Lord Jesus encourageth my weakness, by saying, No man hath seen God at any time John i. 18.  They are the Evangelist’s own words..