“By practice and experience a man can (if the wind be of the right strength) imitate the complete sailing flight of birds by availing himself of the slight upward trend of some winds, by performing circling sweeps, and by allowing the air to carry him.”
The Romance of Aeronautics (1912)
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Otto Lilienthal 16
German aviation pioneer 1848–1896Related quotes
Source: The Wheel of Time: Shamans of Ancient Mexico, Their Thoughts About Life, Death and the Universe], (1998), Quotations from "The Power of Silence" (Chapter 18)

VII. On the Nature of the World and its Eternity.
On the Gods and the Cosmos

“We cannot direct the wind, but we can adjust the sails.”
Small is Beautiful: A Study of Economics As If People Mattered (1973)

“Thought is the wind, knowledge the sail.”
Augustus William Hare and Julius Charles Hare Guesses at Truth (London: Macmillan, ([1827-48] 1867) p. 159.
Misattributed

1840s, Letters from New York (1843)
Source: Letters from New York http://www.bartleby.com/66/67/12267.html,vol. 1, letter 38