The next two lines could be quite confusing after the first reading. A "sweet mood" causes his "pleasant thoughts/ [to] bring sad thoughts to mind." At first, I wondered how a sweet mood and pleasant thoughts could possibly bring sad thoughts, but when I thought about it, I realized that sometimes when you're at your happiest moment, sad memories and ponderings come to mind. Wordsworth continues explaining that his soul was linked to Nature and her works through the wonder of spring. The image of the human soul running through him brings an apparent depth to the poem, turning the theme from spring to a more intimate perspective of man. "And much it grieved my heart to think/ what man has made of man." The lines question a topic that most people will never fathom in their lifetimes. He describes his grieving over the topic of man's world.
To grieve, as defined by Dictionary.com, means "to be in pain of mind on account of an evil." This definition describes exactly how Wordsworth feels about the evil that mankind has made of his world.
Lines 9 and 10 continue to depict the setting that the poet is contemplating. As the spring setting returns to mind, Wordsworth reflects on how the flower appreciates the air it breaths and the birds hop and play with pleasure. The pictures show the simplicity of Nature and her animals, but also the joy they display. He spoke of a "thrill of pleasure," which not only