“There is more to be learned from any good teacher than the subject taught.”
Volume 2, Ch. 1
Fiction, The Book of the Long Sun (1993–1996)
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Gene Wolfe 102
American science fiction and fantasy writer 1931–2019Related quotes

“The world of knowledge takes a crazy turn
When teachers themselves are taught to learn.”
Scene 6
Life of Galileo (1939)

Source: Facing the Lion, Being the Lion: Finding Inner Courage Where It Lives

Savannah Lynn Curtis and John Tyree, Chapter 4, p. 69-70
2000s, Dear John (2006)
Joshua G. Fitch. The art of questioning https://archive.org/stream/artofquestioning00fitcrich#page/n7/mode/2up. 9th edition. Published 1879. pp. 78

“Failure in any given subject is the first qualification towards becoming a teacher.”
Articles
“They are learned by the constant use of the language and cannot be taught in any other fashion.”
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
Context: Mathematics, being very different from the natural languages, has its corresponding patterns of thought. Learning these patterns is much more important than any particular result... They are learned by the constant use of the language and cannot be taught in any other fashion.