31 O greatest, O Supreme Creator of things invisible! O You who are Yourself unseen, and who are incomprehensible! You are worthy, You are verily worthy— if only mortal tongue may speak of You— that all breathing and intelligent nature should never cease to feel and to return thanks; that it should throughout the whole of life fall on bended knee, and offer supplication with never-ceasing prayers. For You are the first cause; in You created things exist, and You are the space in which rest the foundations of all things, whatever they be. You are illimitable, unbegotten, immortal, enduring for aye, God Yourself alone, whom no bodily shape may represent, no outline delineate; of virtues inexpressible, of greatness indefinable; unrestricted as to locality, movement, and condition, concerning whom nothing can be clearly expressed by the significance of man's words. That You may he understood, we must be silent; and that erring conjecture may track You through the shady cloud, no word must be uttered. Grant pardon, O King Supreme, to those who persecute Your servants; and in virtue of Your benign nature, forgive those who fly from the worship of Your name and the observance of Your religion. It is not to be wondered at if You are unknown; it is a cause of greater astonishment if You are clearly comprehended.
But perchance some one dares— for this remains for frantic madness to do— to be uncertain, and to express doubt whether that God exists or not; whether He is believed in on the proved truth of reliable evidence, or on the imaginings of empty rumour. For of those who have given themselves to philosophizing, we have heard that some deny the existence of any divine power, that others inquire daily whether there be or not; that others construct the whole fabric of the universe by chance accidents and by random collision, and fashion it by the concourse of atoms of different shapes; with whom we by no means intend to enter at this time on a discussion of such perverse convictions. For those who think wisely say, that to argue against things palpably foolish, is a mark of greater folly.
Source: Against the Heathen (New Advent)