What I think Momaday meant when he writes: "There are things in nature that engender an awful quiet in the heart of man. . . " is that: There are things in nature that actually seem mysterious and they can leave man in awe and such things will need to be thought over and over before they can be absorbed.
The Way to Rainy Mountain is known to be a book written by N. Scott Momaday. The book tells the journey of the ancestors of Momaday. It starts from the ancient beginnings to their final war and surrender to the United States.
The statement above actually talks about the things that are mysterious in nature which puts man in awe.
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