King James Version (KJV)
As thou knowest not what is the way of the spirit, nor how the bones do grow in the womb of her that is with child: even so thou knowest not the works of God who maketh all.
Modern English
As you do not know the way the spirit comes to the bones in the womb of a woman with child, so you do not know the work of God who makes everything.
Hebrew
כַּאֲשֶׁ֤ר אֵינְךָ֙ יוֹדֵ֔עַ מַה דֶּ֙רֶךְ֙ הָר֔וּחַ כַּעֲצָמִ֖ים בְּבֶ֣טֶן הַמְּלֵאָ֑ה כָּ֗כָה לֹ֤א תֵדַע֙ אֶת מַעֲשֵׂ֣ה הָאֱלֹהִ֔ים אֲשֶׁ֥ר יַעֲשֶׂ֖ה אֶת הַכֹּֽל׃
kaʾasher ʾeynka yvodeʿa mah derek harvḥa kaʿaṣamiym bbeṭen hamleʾah kakah loʾ tedaʿ ʾet maʿasheh haʾelohiym ʾasher yaʿasheh ʾet hakol