“Who dares to teach must never cease to learn.”
In 1912 Dana was asked to supply a Latin quotation suitable for inscription on a new building at Newark State College (now Kean College). Unable to find an appropriate quotation, Dana composed what became the college motto. The New York Times Book Review, March 5, 1967, p. 55.
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John Cotton Dana 2
American librarian and museum director 1856–1929Related quotes

“If you teach a man anything, he will never learn.”

Glimpses of Bengal http://www.spiritualbee.com/tagore-book-of-letters/ (1921)

“The master is not the one who teaches; it's the one who suddenly learns.”
Source: Grande Sertao: Veredas

A Manifesto for a Skeptical Africa (2012)
Context: Most Africans cannot think freely or express their doubts openly because these religions have placed a huge price on freethinking and critical inquiry. Because these belief systems rely on paranormal claims themselves, Africans feel they cannot speak out against superstition as a whole, or they will be ostracized or even killed by religious zealots. Belief in demonic possession, faith healing, and the “restorative” power of holy water can have deadly consequences for believers and whole communities. Africans must reject superstitious indoctrination and dogmatization in public institutions. Africans need to adopt this cultural motto: Dare to think. Dare to doubt. Dare to question everything in spite of what the superstitious around you teach and preach. Africans must begin to think freely in order to ‘emancipate themselves from mental slavery’ and generate ideas that can ignite the flame of an African enlightenment.

“Life, I've learned, is never fair. If they teach anything in schools, that should be it.”

“The authority of those who teach is often an obstacle to those who want to learn.”

“[E]verybody who is incapable of learning has taken to teaching.”
Spoken by "Vivian."
The Decay of Lying (1889)

“In learning you will teach, and in teaching you will learn.”

MUNICH, February 10, 2007. http://www.rferl.org/featuresarticle/2007/02/a50c8a12-b6a8-44ad-92dd-58183e78a032.html
2006- 2010