Just as you do not know the path of the wind and how bones are formed in the womb of the pregnant woman,so you do not know the activity of God who makes all things.
In Ecclesiastes 11:5 Solomon continues with two more analogies (Keith Krell):
Life is unpredictable and mysterious. Solomon says life is just like the wind. The wind operates sovereignly. Humankind cannot create or control it, for the wind is unseen and unknowable. We perceive its presence by its effects.
Likewise, we cannot understand how God forms bones in the womb. This is far beyond our comprehension, so we have to take this by faith. Yet, in doing so, we adhere to the most intelligent option available to us. It is clear that the creation of the human body couldn’t have happened by itself.
Scientist Fred Hoyle says this would be akin to a tornado in a junkyard taking all the pieces of metal lying there and turning them into a Boeing 747.So, of course, since we cannot know God’s activities, we take it in faith that He is the one who makes all things.