“Yet I avoid this practice in the presence of my benefactors and of my superiors.”
The Book of My Life (1930)
Context: This I recognize as unique and outstanding among my faults—the habit... of preferring to say above all things what I know to be displeasing to the ears of my hearers.... I keep it up wilfully, in no way ignorant of how many enemies it makes for me.... Yet I avoid this practice in the presence of my benefactors and of my superiors. It is enough not to fawn upon these, or at least not to flatter them.<!--Ch. 13
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Girolamo Cardano 17
Italian Renaissance mathematician, physician, astrologer 1501–1576Related quotes

Flying Lessons https://www.faasafety.gov/files/gslac/library/documents/2009/Jan/31383/FLYING%20LESSONS%20090108.pdf, Federal Aviation Administration (8 January 2008)

Preface.
A History of Science Vol.2 Hellenistic Science and Culture in the Last Three Centuries B.C. (1959)

Regarding her choice to not go to Arizona for a play at the time of her father's holiday being rejected by voters. http://books.google.com/books?id=d7sDAAAAMBAJ&pg=PA18&dq=yolanda+king+attallah+shabazz&hl=en&sa=X&ei=Feu5Uv_lAdjgoAS314GYCQ&ved=0CDEQ6AEwAQ#v=onepage&q=yolanda%20king%20attallah%20shabazz&f=false
1990s

“I have never regarded any man as my superior, either in my life outside or inside prison.”
Nelson Mandela on equaliy, From a letter to General Du Preez, Commissioner of Prisons, Written on Robben Island, Cape Town, South Africa (12 July 1976). Source: From Nelson Mandela By Himself: The Authorised Book of Quotations © 2010 by Nelson R. Mandela and The Nelson Mandela Foundation http://www.nelsonmandela.org/content/mini-site/selected-quotes
1970s

The Book of My Life (1930)
Context: I have accustomed my features always to assume an expression quite contrary to my feelings; thus I am able to feign outwardly, yet within know nothing of dissumulation. This habit is easy if compared to the practice of hoping for nothing, which I have bent my efforts toward acquiring for fifteen successive years, and have at last succeeded.<!--Ch. 13

“Every man is my superior in that I may learn from him.”