He shows that just being educated and knowing how things work does not mean that you truly and deeply understand and enjoy nature. Scientific explanations remove the magic that nature can have and explaining a star can never be as great as observing stars during a night. That is what Whitman is trying to say.
The two best answer that reveals nature is severe and unkind are "Sweating in the heat, we had lost the whole day, dreading to be buried alive in the drifting sand." and "Sand in the scanty food, sand in the blackish water--water that was drunk lukewarm from a clammy, loathsome water skin." hope this helps :)
Answer:
hewwo tanks for da free points
how are you
Evidence from the passage and from your own point of view also support your reasons I hope I was helpful if not I am truly sorry.