“Since the wings are swifter to press the air than the air is to escape from beneath the wings the air becomes condensed and resists the movement of the wings; and the motive power of these wings by subduing the resistance of the air raises itself in a contrary movement to the movement of the wings.”

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

Speech on “Lenin, Trotsky and Socialism and the Soviet Union”, (March 15, 1989) https://www.youtube.com/watch?v=yQsceZ9skQI
Quotes 1960s-1980s, 1980s
Context: Lenin was a right-wing deviation of the socialist movement and he was so regarded…by the mainstream Marxists… Bolshevism was a right-wing deviation.

Notes Toward a Supreme Fiction (1942), It Must Give Pleasure
Context: What am I to believe? If the angel in his cloud,
Serenely gazing at the violent abyss,
Plucks on his strings to pluck abysmal glory, Leaps downward through evening’s revelations, and
On his spredden wings, needs nothing but deep space,
Forgets the gold centre, the golden destiny,Grows warm in the motionless motion of his flight,
Am I that imagine this angel less-satisfied?
Are the wings his, the lapis-haunted air?

Speech on “Lenin, Trotsky and Socialism and the Soviet Union”, (March 15, 1989) https://www.youtube.com/watch?v=yQsceZ9skQI
Quotes 1960s–1980s, 1980s

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

The Ancestress (Spoken by Bertha)
The Venetian Bracelet (1829)

(31st January 1829) Lines to the Author after Reading the Sorrows of Rosalie
The London Literary Gazette, 1829

The Notebooks of Leonardo Da Vinci (1938), XVII Flight

Bequest of Pavlov to the Academic Youth of His Country. Science, Vol. 83, Issue 2155, pg. 369 (1936)