“Like most chairmen, he teaches only one class of Seniors; the most experienced teachers are frequently promoted right out of the classroom!”

— Bel Kaufmanová , book Up the Down Staircase

Part II, ch. 9 (Sylvia Barrett)
Up the Down Staircase (1965)

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Bel Kaufmanová 25

American novelist, teacher 1911–2014

W. Cleon Skousen book The Naked Communist

The Naked Communist (1958)

“Teachers frequently talk about moments in which they became students again and how much that made them better teachers. For me, there has been no better way to improve my teaching, specifically my teaching in the composition classroom, than to take up a subject at which I am abysmal.”

Adrianne Wadewitz (1977–2014) academic and Wikipedian

Wadewitz, Adrianne. (August 12, 2013). "What I learned as the worst student in the class" http://www.hastac.org/blogs/wadewitz/2013/08/12/what-i-learned-worst-student-class. HASTAC: Humanities, Arts, Science, and Technology Alliance Collaboratory. — reprinted and cited in: "How Adrianne Wadewitz learnt to embrace failure" http://www.smh.com.au/world/how-adrianne-wadewitz-learnt-to-embrace-failure-20140425-zqzgx.html. The Sydney Morning Herald. April 25, 2014. Retrieved April 25, 2014.

“What is most apparent and constant in Thomas' personality, the image he most likely had of himself, is the teacher. The saint was essentially a Doctor of the Church; the man was a teacher of theology and philosophy; the mystic never entirely separated his meditations from his teaching, which drew its inspiration from them.”

Étienne Gilson (1884–1978) French historian and philosopher

Introduction
Thomism: The Philosophy of Thomas Aquinas

“As a teacher and parent, I've had a very personal interest in seeking new ways of teaching. Like most other teachers and parents, I've been well aware — painfully so, at times — that the whole teaching/learning process is extraordinarily imprecise, most of the time a hit-and-miss operation. Students may not learn what we think we are teaching them and what they learn may not be what we intended to teach them at all.”

Betty Edwards (1926) American artist

Source: The New Drawing on the Right Side of the Brain (1979), p.237

“Another of humanity’s early awakened teachers emerged in China. His name was Lao Tzu. He left a record of his teaching in the form of one of the most profound spiritual books ever written, the Tao Te Ching.”

Eckhart Tolle book A New Earth

A New Earth (2005)

“By pursuing his own interest he frequently promotes that”

Adam Smith (1723–1790) Scottish moral philosopher and political economist

Source: The Wealth of Nations (1776), Book IV, Chapter II, p. 488-489. 
Context: As every individual, therefore, endeavours as much as he can both to employ his capital in the support of domestic industry, and so to direct that industry that its produce may be of the greatest value; every individual necessarily labours to render the annual revenue of the society as great as he can. He generally, indeed, neither intends to promote the public interest, nor knows how much he is promoting it. By preferring the support of domestic to that of foreign industry, he intends only his own security; and by directing that industry in such a manner as its produce may be of the greatest value, he intends only his own gain, and he is in this, as in many other cases, led by an invisible hand to promote an end which was no part of his intention. Nor is it always the worse for the society that it was no part of it. By pursuing his own interest he frequently promotes that of the society more effectually than when he really intends to promote it. I have never known much good done by those who affected to trade for the public good. It is an affectation, indeed, not very common among merchants, and very few words need be employed in dissuading them from it.