Source: The Capture (2003), Chapter One: "A Nest Remembered", p. 1
“You shall find, that there cannot be a greater spur to the attaining what you would have the eldest learn, and know himself, than to set him upon teaching it his younger brothers and sisters.”
Sec. 119
Some Thoughts Concerning Education (1693)
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John Locke 144
English philosopher and physician 1632–1704Related quotes

al-Ghazali https://awakenthegreatnesswithin.com/35-inspirational-imam-al-ghazali-quotes-on-success/

“You cannot teach a man anything, you can only help him to find it within himself.”
As quoted in How to Win Friends and Influence People (1935) by Dale Carnegie, p. 117; also paraphrased as "You cannot teach a man anything, you can only help him to find it for himself." Attributions are found as early as 1882.
Attributed
Source: Google Books link https://books.google.com/books?id=h70_AQAAMAAJ&pg=PA476&dq=You+cannot+teach+a+man+anything;+you+can+only+help+him+find+it+within+himself&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMI39Gmss_gyAIVRNRjCh1Q2wGN#v=onepage&q=%22You%20cannot%20teach%22&f=false

“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

Source: A Heap o' Livin' (1916), When You Know a Fellow, stanza 1, p. 12.

Ezra Pound, ABC of Reading (New Haven: Yale University Press, 1934), p. 103.
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Farrakhan speaks in Birmingham to support Voting Rights Act https://www.al.com/spotnews/2013/06/farrakhan_speaks_in_birmingham.html (14 June 2013)