Eccl 11:5

“"As you do not know what is the way of the spirit, nor how the bones do grow in the womb of her that is with child: even so you know not the works of God who makes all. "Just as you do not know the way of the spirit and of the soul entering a child, and are unknowing of the types of bone and veins in the stomach of a pregnant woman. It is hard to know how the human body is formed from the simplest elements into the many varied forms and limbs, and from the very same seed, one makes soft our hair, another makes our bones hard; one connects the veins, another links the nerves together. Thus you cannot know the work of God, who has made all things. From this he teaches that the variety of things in the world must not be feared, and you must not fear the winds and the clouds, which as we have mentioned above must be judged. But although the sower ought to reap in the course of his career, he ought to save the outcome for the judgement of the Lord.”

“Men then sing of the Lord, when either spirits from above, or perfect teachers, make known to us His power. But yet His work is not known; because doubtless even they who preach Him, venerate His unpenetrated judgments. They, therefore, both know Him, Whom they preach, and yet know not His works: because they know, by grace, Him, by Whom they were made, but yet cannot understand His judgments, which are wrought by Him even above their understanding. For that Almighty God is not clearly seen in His doings the Psalmist bears witness, saying, Who hath made darkness His secret place. And again, Thy judgments are a great deep. And again, The deep like a garment is His clothing. Whence also it is well said by Solomon, As thou knowest not what is the way of the spirit, nor how the bones grow together in the belly of her that is with child, so thou knowest not the works of God, Who is the Maker of all things.”

“As you know not what is the way etc. Above he said that times are not to be observed; here, second, he teaches that divine works are not to be considered or scrutinized, because we cannot; therefore he says: As you know not what is the way of the spirit. The Spirit, who is God, because this we do not know; whence John 3: "The Spirit breathes where He wills, and you hear His voice, but you know not," etc.; and Job 9: "If He comes to me, I shall not see Him; if He departs, I shall not perceive it." The spirit, which is the soul or spiritual creature, whose way, that is, origin, is not known, nor indeed its end; above, in chapter 3: "Who knows whether the spirit of the sons of Adam ascends upward?" The spirit, which is the wind, whose way is not known, that is, its origin; whence in the Psalm: "Who brings forth the winds from His treasuries"; Exodus 15: "Your spirit blew, and the sea covered them." He says therefore: As you know not what is the way of the spirit, and by what reason the bones are joined together in the womb of a pregnant woman, that is, how they are fitted together and differentiated: because even Avicenna himself says that the formative power of the members is a divine power: 2 Maccabees 7: "I know not how you appeared in my womb; for I neither gave you spirit and soul, nor did I fashion the members of each of you": but He fashioned them, to whom it is said in Job 10: "You have knit me together with bones and sinews." Just as you are ignorant of these things, which are carnal, so you are ignorant of the works of the Lord, who is the maker of all things: works, that is, hidden judgments, concerning which it is said in the Psalm: "Great are the works of the Lord, sought out according to all His purposes." These works we do not know: Romans 11: "O the depth of the riches of the wisdom and knowledge of God! How incomprehensible are His judgments, and how unsearchable His ways!"”