“Perhaps the topic [of this book] will appear fairly difficult to you because it is not yet familiar knowledge and the understanding of beginners is easily confused by mistakes; but with your inspiration and my teaching it will be easy for you to master, because clear intelligence supported by good lessons is a fast route to knowledge.”
Following the dedication to Dionysus as quoted by Paul Drijvers, Secondary Algebra Education (2011)
Arithmetica (c. 250 AD)
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Diophantus 3
Alexandrian Greek mathematicianRelated quotes

“If you cannot teach knowledge, than you should teach your intuition.”
Majlisi, Bihārul Anwār, vol.78, p. 111
Regarding Knowledge

Friedrich Hayek (1991). "On being an economist." In: W. W. Bartley and S. Kresge (eds.), The Trend of Economic Thinking; Essays on Political Economists and Economic History, Volume III, London. Routledge. p. 38
1980s and later

as quoted in Nature and Culture: American Landscape and Painting, 1825-1875, Barbara Novak; Oxford University Press, 2007, note 74
undated

“Believe me, you will find more lessons in the woods than in books. Trees and stones will teach you what you cannot learn from masters.”
Experto crede: aliquid amplius invenies in silvis, quam in libris. Ligna et lapides docebunt te, quod a magistris audire non possis.
Epistola CVI, sect. 2; translation from Edward Churton The Early English Church ([1840] 1841) p. 324

Your Strength As A Rationalist http://lesswrong.com/lw/if/your_strength_as_a_rationalist/ (August 2007)

Maxim no .1.
The Maxims of Ptahhotep (c. 2350 BCE)
Context: Do not be arrogant because of your knowledge, but confer with the ignorant man as with the learned. For knowledge has no limits, and none has yet achieved perfection in it. Good speech is more hidden than malachite, yet it is found in the possession of women slaves at the millstones.