5 But some one will say, If the Divine substance is incomprehensible, why then do you 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, would you have me go away altogether hungry? I praise and glorify Him that made us; for it is a divine command which says, Let every breath praise the Lord. 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 encourages my weakness, by saying, No man has seen God at any time.
Source: Catechetical Lectures (New Advent)