I included the definition but I also included your the answer to your question :)
Proverbs 30:4 states, "Who has gone up to heaven and come down? Whose hands have gathered up the wind? Who has wrapped up the waters in a cloak? Who has established all the ends of the earth? What is his name, and what is the name of his son? Surely you know!"
The verse is a rhetorical question, emphasizing the incomprehensible nature of God's power and knowledge. It suggests that no human being can fully understand or explain God's ways or actions.
Therefore, John the Baptist, in using this verse in response to Nicodemus's curiosity, may be indicating that some things are beyond human understanding and can only be revealed through faith and trust in God.