Read the excerpt from Walden.

This is a delicious evening, when the whole body is one sense, and imbibes delight through every pore. I go and come with a strange liberty in Nature, a part of herself. As I walk along the stony shore of the pond in my shirt-sleeves, though it is cool as well as cloudy and windy, and I see nothing special to attract me, all the elements are unusually congenial to me.

Which best states what the imagery in the excerpt suggests?
Thoreau believes he is the only one to ever experience this type of night.
Thoreau believes he is experiencing a perfect night that will never happen again.
Thoreau feels like an outsider as he observes the objects in his environment.
Thoreau feels as if he is in harmony with the aspects of his environment.