Youcat commented through CCC. Question n. 6.

YOUCAT Question n. 6 - Can we grasp God at all in concepts? Is it possible to speak about him meaningfully?

(Youcat answer) Although we men are limited and the infinite greatness of God never fits into finite human concepts, we can nevertheless speak rightly about God.   

A deepening through CCC

(CCC 39) In defending the ability of human reason to know God, the Church is expressing her confidence in the possibility of speaking about him to all men and with all men, and therefore of dialogue with other religions, with philosophy and science, as well as with unbelievers and atheists. (CCC 40) Since our knowledge of God is limited, our language about him is equally so. We can name God only by taking creatures as our starting point, and in accordance with our limited human ways of knowing and thinking. (CCC 41) All creatures bear a certain resemblance to God, most especially man, created in the image and likeness of God. The manifold perfections of creatures - their truth, their goodness, their beauty all reflect the infinite perfection of God. Consequently we can name God by taking his creatures’ perfections as our starting point, "for from the greatness and beauty of created things comes a corresponding perception of their Creator" (Wis 13:5). (CCC 42) God transcends all creatures. We must therefore continually purify our language of everything in it that is limited, imagebound or imperfect, if we are not to confuse our image of God --"the inexpressible, the incomprehensible, the invisible, the ungraspable"-- with our human representations  (Liturgy of St. John Chrysostom, Anaphora). Our human words always fall short of the mystery of God.   

Reflecting and meditating 

(Youcat comment) In order to express something about God, we use imperfect images and limited notions. And so everything we say about God is subject to the reservation that our language is not equal to God’s greatness. Therefore we must constantly purify and improve our speech about God.

(CCC Comment)

(CCC 43) Admittedly, in speaking about God like this, our language is using human modes of expression; nevertheless it really does attain to God himself, though unable to express him in his infinite simplicity. Likewise, we must recall that "between Creator and creature no similitude can be expressed without implying an even greater dissimilitude" (Lateran Council IV: DS 806); and that "concerning God, we cannot grasp what he is, but only what he is not, and how other beings stand in relation to him" (St. Thomas Aquinas, SCG I, 30). (CCC 48) We really can name God, starting from the manifold perfections of his creatures, which are likenesses of the infinitely perfect God, even if our limited language cannot exhaust the mystery. 

(The next question is: Why did God have to show himself in order for us to be able to know what he is like?)