Psalms 139:6

And so, when you have gone over all these points with suitable reflections on each, when you have, in addition, studied the process of breathing, the manner in which the heart conserves its warmth, the organs of digestion and the veins, you will discern in all of these wonders the inscrutable wisdom of the Creator; so that you will be able to say with the prophet: “Your knowledge is become wonderful” from the study of myself. “Give heed, therefore, to yourself,” that you may give heed to God, to whom be glory and power forever and ever. Amen.

In truth, to know oneself seems to be the hardest of all things. Not only our eye, which observes external objects, does not use the sense of sight on itself, but even our mind, which contemplates intently another’s sin, is slow in the recognition of its own defects. Therefore, even at present our speech, after eagerly investigating matters pertaining to others, is slow and hesitant in the examination of our own nature. Yet, it is not possible for one, intelligently examining himself, to learn to know God better from the heavens and earth than from our own constitution, as the prophet says, “Your knowledge is become wonderful from myself”; that is, having carefully observed myself, I have understood the superabundance of wisdom in you.

Therefore, let us listen to what the prophet says about this: “Your knowledge is too wonderful for me.” But let us see what he says further on: “I will give you thanks, for you are fearful and wonderful.” Why “fearful”? We wonder at the beauty of columns, mural art, the physical bloom of youth. Again, we wonder at the open sea and its limitless depth, but we wonder fearfully when we stoop down and see how deep it is. It was in this way that the prophet stooped down and looked at the limitless and yawning sea of God’s wisdom. And he was struck with shuddering. He was deeply frightened, he drew back, and he said in a loud voice, “I will give you thanks for you are fearfully wondrous; wondrous are your works.” And again, “Your knowledge is too wondrous for me; it is too lofty and I cannot attain to it.”Do you see how prudent the servant is and how grateful is his heart? What he is saying is this: “I thank you that I have a Master whom I cannot comprehend.” And he is not now speaking of God’s essence. He passes over the incomprehensibility of his essence as if it is something on which everybody is agreed. What he is speaking of here is God’s omnipresence; and he is showing that this is the very thing that he does not understand, namely, how God is present everywhere. To prove to you that he is speaking of God’s omnipresence, listen to what follows: “If I go up to heaven, you are there; if I go down to hell, you are present.” Do you see how God is everywhere present? The prophet did not know how this was true but he shudders, he is upset, he is at a loss when he so much as thinks about it.

Do we, whose minds are so feeble, believe that we can comprehend whether God’s foresight is the same as his memory and understanding, who do not behold individual things by thought but embraces all that he knows in one eternal, unchangeable and ineffable vision? In this difficulty and distress, therefore, we may indeed cry aloud to the living God, “Your knowledge is become wonderful to me; it is sublime, and I cannot reach it.” For I understand from myself how wonderful and how incomprehensible your knowledge is, by which you have made me, when I consider that I cannot even comprehend myself whom you have made; and yet in my meditation a fire flames out, “so that I seek your face evermore.”

"Your skill has displayed itself wonderfully in me: it has waxed mighty: I shall not be able to attain unto it" [Psalm 139:6]. Listen now and hear somewhat, which is obscure indeed, yet brings no small pleasure in the understanding thereon. Moses, the holy servant of God, with whom God spoke by a cloud, for, speaking after human fashion, He must needs speak to His servant through some work of His hands which He assumed,...longed and desired to see the true appearance of God, and said to God, who was conversing with him, "If now I have found grace in Your sight, show me Yourself." [Exodus 33:13] When this he desired vehemently, and would extort from God in that sort of friendly familiarity, if we may so speak, wherewith God deigned to treat him, that he might see His Glory and His Face, in such wise as we can speak of God's Face, He said unto him, "You can not see My Face; for no one has seen My Face, and lived;" [Exodus 33:20] but I will place you in a cleft of the rock, and will pass by, and will set My hand upon you; and when I have passed by, you shall see My back parts. And from these words there arises another enigma, that is, an obscure figure of the truth. "When I have passed by," says God, "you shall see My back parts;" as though He has on one side His face, on another His back. Far be it from us to have any such thoughts of that Majesty! For whoso has such thoughts of God, what advantages it him that the temples are closed? He is building an idol in his own heart. In these words then are mighty mysteries....They who raged against the Lord, whom they saw, now seek counsel how they may be saved; and it is said to them, "Repent, and be baptized every one of you in the Name of Jesus Christ, and your sins shall be forgiven you." [Acts 2:38] Behold, they saw the back parts of Him, whose face they could not see. For His Hand was upon their eyes, not for ever, but while He passed by. After He had passed He took away His Hand from their eyes. When the hand was taken from their eyes, they say to the disciples, "What shall we do?" At first they are fierce, afterwards loving; at first angry, afterwards fearful; at first hard, then pleasant; at first blind, then enlightened....

And so loud is their proclamation that the whole human race hears their voice, “There are no speeches or utterances where their voices are not heard.” For every race and every tongue hears the proclamations of day and night. Tongue differs from tongue, but nature is one and derives the same lesson from day and night. Thus the same author, singing the praises of the Creator in another psalm, says, “Your knowledge was wonderful to me; I was overwhelmed, and I could not reach to it.”

Since water does not support horses, donkeys, mules, the tracks of wheels and the marks of wagons and chariots, which are all unmistakable guides to travelers by land, the Maker of the universe has given to the broad seas the disposition of the stars like road tracks on land.Praise the wonders of divine providence!
Oh! Ineffable love! Oh! unspeakable wisdom!
Who could marvel enough at the goodness of divine providence, at its power, its nobility in difficulties, its ease in managing awkward situations, its magnificence, its resourcefulness? Truly your knowledge was wonderful to me: “I was overwhelmed and could not reach to it.” That is my exclamation, too. If you listen to me, you too will recite these words with me, praise the Benefactor with all your might and render grateful words of thanks for his countless blessings.