"It was a divine spring, and the season contributed greatly to my convalescence." (76)
This quote shows that nature is the reason he feels good, and has healed him from his sickness.
"She continued with her foster parents and bloomed in their rude abode, fairer than a garden rose among dark-leaved brambles." (40)
This quote represents the beauty of nature, nature is so enchanting that Frankenstein even compares the love of his life to it.
"A creature who seemed to shed radiance from her looks and whos form and motions were lighter than the chamois of the hills." (40)
This quote also is an example of the beauty of nature, and how his beloved is so beautiful he compares her to the most beautiful thing he knows of, nature.
"...And immediately after their union they sought the pleasant climate of Italy, and the change of scene and interest attendant on a tour through that land of wonders as a restorative for her weakened frame." (38)
Nature was the very thing that brought Elizabeth back to health after they went to Italy, and made her better.
“Even broken in spirit as he is, no one can feel more deeply than he does the beauties of nature. The starry sky, the sea, and every sight afforded by these wonderful regions, seems still to have the power of elevating his soul from earth. Such a man has a double existence: he may suffer misery, and be overwhelmed by disappointments; yet, when he has retired into himself, he will be like a celestial spirit that has a halo around him, within whose circle no grief or folly ventures.” (31)
This shows the restorative power of nature. Even on his death bed he is happy in his soul because of all of the wonders around him, and no matter how bad things get we are always connected to nature in a beautiful way.