Date: 1667; 2nd ed. in 1674

"Then feed on thoughts, that voluntary move / Harmonious numbers; as the wakeful bird / Sings darkling, and in shadiest covert hid / Tunes her nocturnal note."

— Milton, John (1608-1674)

Date: 1804, 1807

"Their souls shall reach the Sabbath of the skies;-- / As birds, from bleak Norwegia's wintry coast / Blown out to sea, strive to regain the shore, / But, vainly striving; yield them to the blast,-- / Swept o'er the deep to Albion's genial isle, / Amazed they light amid the bloomy sprays / Of som...

— Graham, James (1765-1811)

Date: 1818

Love is a fluttering in the heart or rather a "Young feather'd tyrant"

— Keats, John (1795-1821)

Date: 1818

"Great Muse, thou know'st what prison, / Of flesh and bone, curbs, and confines, and frets / Our spirit's wings."

— Keats, John (1795-1821)

Date: 1818 (1819?)

"His soul has in its Autumn, when his wings / He furleth close."

— Keats, John (1795-1821)

Date: 1818 (1819?)

"He has his Summer, when luxuriously / Spring's honied cud of youthful thought he loves / To ruminate"

— Keats, John (1795-1821)

Date: 1820

"Open wide the mind's cage-door, / She'll dart forth, and cloudward soar."

— Keats, John (1795-1821)

Date: 1820

"As though a tongueless nightingale should swell / Her throat in vain, and die, heart -stifled, in her dell"

— Keats, John (1795-1821)

Date: 1820

A soul may be "as ill at peace as the break-covert bloodhounds of such sin"

— Keats, John (1795-1821)

Date: 1820

The spirit may, like a "demon-mole," work thorugh "clayey soil and gravel hard"

— Keats, John (1795-1821)