“Experience alone can teach us the best forms of construction for sailing apparatus in order that they may be of sufficient strength, very light, and most easily managed.”
The Romance of Aeronautics (1912)
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Otto Lilienthal 16
German aviation pioneer 1848–1896Related quotes

“Failure isn’t the best teacher. Neither is experience. Only evaluated experience teaches us.”
Book Sometimes you win Sometimes you Learn

Individual Liberty (1926), Liberty and Politics

"Judo: The Japanese Art of Self Defense", as translated in A Complete Guide to Judo : It's Story and Practice (1958) by Robert W. Smith http://www.judoinfo.com/kano2.htm
Context: In Randori we teach the pupil to act on the fundamental principles of Judo, no matter how physically inferior his opponent may seem to him, and even if by sheer strength he can easily overcome him; because if he acts contrary to principle his opponent will never be convinced of defeat, no matter what brute strength he may have used.

“English Aphorists,” pp. 102-103
Reperusals and Recollections (1936)

“You ask which form of government is the best? Whichever teaches us to govern ourselves.”
Welche Regierung die beste sei? Diejenige, die uns lehrt, uns selbst zu regieren.
Maxim 353, trans. Stopp
Variant translation by Saunders: Which is the best government? That which teaches us to govern ourselves. (225)
Maxims and Reflections (1833)

“It's those who lie outside ordinary experience who have the most to teach us.”
Malcolm Gladwell (2008). Outliers: The Story of Success. p. 198