“What! alive, and so bold, O earth?”
Written on hearing the News of the Death of Napoleon; reported in Bartlett's Familiar Quotations, 10th ed. (1919)
Percy Bysshe Shelley was one of the major English Romantic poets, who is regarded by some as among the finest lyric and philosophical poets in the English language, and one of the most influential. A radical in his poetry as well as in his political and social views, Shelley did not see fame during his lifetime, but recognition of his achievements in poetry grew steadily following his death. Shelley was a key member of a close circle of visionary poets and writers that included Lord Byron, John Keats, Leigh Hunt, Thomas Love Peacock and his own second wife, Mary Shelley, the author of Frankenstein.
Shelley is perhaps best known for classic poems such as "Ozymandias", "Ode to the West Wind", "To a Skylark", "Music, When Soft Voices Die", "The Cloud" and The Masque of Anarchy. His other major works include a groundbreaking verse drama, The Cenci , and long, visionary, philosophical poems such as Queen Mab , Alastor, The Revolt of Islam, Adonais, Prometheus Unbound – widely considered to be his masterpiece, Hellas: A Lyrical Drama and his final, unfinished work, The Triumph of Life .
Shelley's close circle of friends included some of the most important progressive thinkers of the day, including his father-in-law, the philosopher William Godwin, and Leigh Hunt. Though Shelley's poetry and prose output remained steady throughout his life, most publishers and journals declined to publish his work for fear of being arrested for either blasphemy or sedition. Shelley's poetry sometimes had only an underground readership during his day, but his poetic achievements are widely recognized today, and his political and social thought had an impact on the Chartist and other movements in England, and reach down to the present day. Shelley's theories of economics and morality, for example, had a profound influence on Karl Marx; his early – perhaps first – writings on nonviolent resistance influenced Leo Tolstoy, whose writings on the subject in turn influenced Mahatma Gandhi, and through him Martin Luther King Jr. and others practicing nonviolence during the American civil rights movement.
Shelley became a lodestar to the subsequent three or four generations of poets, including important Victorian and Pre-Raphaelite poets such as Robert Browning and Dante Gabriel Rossetti. He was admired by Oscar Wilde, Thomas Hardy, George Bernard Shaw, Leo Tolstoy, Bertrand Russell, W. B. Yeats, Upton Sinclair and Isadora Duncan. Henry David Thoreau's Civil Disobedience was apparently influenced by Shelley's writings and theories on nonviolence in protest and political action. Shelley's popularity and influence has continued to grow in contemporary poetry circles. Wikipedia

“What! alive, and so bold, O earth?”
Written on hearing the News of the Death of Napoleon; reported in Bartlett's Familiar Quotations, 10th ed. (1919)
"Verses On A Cat" (1800), St. 2, as published in Life of Shelley (1858) by Thomas Jefferson Hogg, p. 21
Song to the Men of England (1819), st. 5
“Hell is a city much like London —
A populous and smoky city.”
Peter Bell the Third http://www.gutenberg.org/etext/4697 (1819), Pt. III, st. 1
Good-Night http://www.online-literature.com/shelley_percy/complete-works-of-shelley/133/ (1819)
"On the Vegetable System of Diet" (c. 1815; published in the 1920s), in Complete Works, ed. Roger Ingpen and Walter E. Peck, Volume 6 (New York: Gordian Press, 1965), pp. 343-344, original emphasis
“Dar’st thou amid the varied multitude
To live alone, an isolated thing?”
"The Solitary" (1810), st. 1
“I never thought before my death to see
Youth's vision thus made perfect.”
Percy Bysshe Shelley Epipsychidion
Source: Epipsychidion (1821), l. 41
On a Future State (1815; publ. 1840)
Untitled (1810); titled "Love's Rose" by William Michael Rossetti in Complete Poetical Works of Percy Bysshe Shelley (1870)
To Night http://www.readprint.com/work-1379/Percy-Bysshe-Shelley (1821), st. 1
“Revenge is the naked idol of the worship of a semi-barbarous age.”
A Defence of Poetry http://www.bartleby.com/27/23.html (1821)
Article 23 <br class="br"> "Declaration of Rights" http://knarf.english.upenn.edu/PShelley/declarat.html (1812)
Percy Bysshe Shelley Prometheus Unbound
Voice of Unseen Spirits, Act IV, l. 1
Prometheus Unbound (1818–1819; publ. 1820)
“Can man be free if woman be a slave?”
Percy Bysshe Shelley The Revolt of Islam
Canto II, st. 43
The Revolt of Islam (1817)
Source: To Jane: The Invitation (1822), l. 17
St. 7 <br class="br"> Song: Rarely, Rarely, Comest Thou http://www.poetryconnection.net/poets/Percy_Bysshe_Shelley/17889 (1821)
“Tragedy delights by affording a shadow of the pleasure which exists in pain.”
A Defence of Poetry http://www.bartleby.com/27/23.html (1821)
Percy Bysshe Shelley Queen Mab
Notes
Queen Mab (1813)
Variant: It is only by softening and disguising dead flesh by culinary preparation, that it is rendered susceptible of mastication or digestion; and that the sight of its bloody juices and raw horror does not excite intolerable loathing and disgust.
Source: Julian and Maddalo http://www.bartleby.com/139/shel115.html (1819), l. 170
“To know nor faith, nor love, nor law, to be
Omnipotent but friendless, is to reign.”
Percy Bysshe Shelley Prometheus Unbound
Asia, Act II, sc. iv, l. 47
Prometheus Unbound (1818–1819; publ. 1820)
“It doth repent me; words are quick and vain;
Grief for awhile is blind, and so was mine.”
Percy Bysshe Shelley Prometheus Unbound
Prometheus, Act I, l. 304
Prometheus Unbound (1818–1819; publ. 1820)
Article 1 <br class="br"> "Declaration of Rights" http://knarf.english.upenn.edu/PShelley/declarat.html (1812)
“Chameleons feed on light and air:
Poets' food is love and fame.”
An Exhortation http://www.poetryconnection.net/poets/Percy_Bysshe_Shelley/2579 (1819), st. 1
The Question http://rpo.library.utoronto.ca/poem/1907.html (1820), st. 2
On a Future State (1815; publ. 1840)
Percy Bysshe Shelley Queen Mab
Canto III
Queen Mab (1813)
“Thou art unseen, but yet I hear thy shrill delight.”
Percy Bysshe Shelley To a Skylark
St. 4
To a Skylark (1821)
This passage has sometimes been paraphrased as "History is a cyclic poem written by Time upon the memories of man". <br class="br"> A Defence of Poetry http://www.bartleby.com/27/23.html (1821)
“That orbed maiden with white fire laden,
Whom mortals call the moon.”
Percy Bysshe Shelley The Cloud
The Cloud, iv; reported in Bartlett's Familiar Quotations, 10th ed. (1919)
On a Future State (1815; publ. 1840)