“The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.”
B 8
Critique of Pure Reason (1781; 1787)
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Immanuel Kant 200
German philosopher 1724–1804Related quotes

Der Vogelflug als Grundlage der Fliegekunst (1889); English edition: Birdflight As The Basis of Aviation (1911).

The Golden Violet - The Child of the Sea
The Golden Violet (1827)

quote, c. 1930; https://utopiadystopiawwi.wordpress.com/constructivism/vladimir-tatlin/letalin/ cited by Christina Lodder, in Russian Constructivism; Yale University Press, Connecticut, 1983, p. 213
The 'Letatlin' was a glider, what Tatlin called an 'air bike', since it would be manually pedaled by the user and contain no motor
Quotes, 1926 - 1954

From We Are Nothing But a Gaze (Ma Heech, Ma Negah); cited in: Bahiyeh Afnan Shahid (2013) Sohrab Sepehri: A Selection of Poems from the Eight, p. 16.

Verses supposed to be written by Alexander Selkirk.
Bartlett's Familiar Quotations, 10th ed. (1919)

Die Romane sind die sokratischen Dialoge unserer Zeit. In diese liberale Form hat sich die Lebensweisheit vor der Schulweisheit geflüchtet.
Lucinde and the Fragments, P. Firchow, trans. (1991), “Critical Fragments,” § 26