“The saying "He who teaches others, teaches himself" is very true, not only because constant repetition impresses a fact indelibly on the mind, but because the process of teaching itself gives deeper insight into the subject taught.”
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John Amos Comenius 12
Czech teacher, educator, philosopher and writer 1592–1670Related quotes

“Teaching others, he corrected himself.”
“Socrates,” p. 67
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Source: Malcolm X Speaks: Selected Speeches and Statements
Source: Malcolm X Speaks (1965), p. 22

Dissertation for doctor of philosophy in christian education (May 25, 1991)
Source: Persecution and the Art of Writing (1952), Persecution and the Art of Writing, p. 36