According to this excerpt from Emerson's essay "Nature," what is the greatest Delight that nature ministers or provides to man?

"The greatest Delight which the fields and woods minister, is the suggestion of an occult relation between man and the vegetable. I am not alone and unacknowledged. They nod to me, and I to them. The waving of the boughs in the storm, is new to me and old. it takes me by surprise, and yet is not unknown. Its effect is like that of a higher salt or a better emotion coming over me, when I deemed I was thinking justly or doing right."​