How does Ralph Waldo Emerson use imagery in Self-Reliance?

Emerson's tight rational argument in "Self-Reliance" is complemented by energetic and passionate language that appeals to readers' emotions.Among the more effective techniques here is the use of images from nature: "My book should smell of pines and resound with the hum of insects" and, "before a leaf-bud has burst, its whole life acts; in the full-blown flower there is no more; in the leafless root there is no less." Railing against men's inappropriate feelings of timidity, Emerson accuses them of being "ashamed before the blade of grass or the blowing rose."