“Tsze-Kung asked, “Is there one word with which to act in accordance throughout a lifetime?” The Master said, “Is not reciprocity such a word? What you do not want done to yourself, do not do to others.”
Source: The Analects
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Confucius 269
Chinese teacher, editor, politician, and philosopher -551–-479 BCRelated quotes

Source: The Doctrine of the Mean

“It is not fair to ask of others what you are unwilling to do yourself.”
http://books.google.com/books?id=EcKZ8bbMLDMC&q=%22It+is+not+fair+to+ask+of+others+what+you+are+not+willing+to+do+yourself%22&pg=PA64#v=onepage
http://www.gwu.edu/~erpapers/myday/displaydoc.cfm?_y=1946&_f=md000366
15 June 1946
My Day (1935–1962)

Express Yourself Fully (page 8)
Not Always So, practicing the true spirit of Zen (2002)

“When asked, "How do you write?" I invariably answer, "one word at a time."”
The Stand (Uncut), Preface (part 2)
The Stand (1978)
Variant: Ask yourself three questions and you will know who you are. Ask 'What do you believe in? What do you hope for? But most important - ask what do you love?
Source: The Bronze Horseman (2001)

“Don't do unto others what you don't want done unto you.”
Variant: What you do not want done to yourself, do not do to others.
Source: The Analects, Other chapters, Chapter XVː23

“Do yourself what you wish others to do.”
Source: Sayings of Sri Ramakrishna (1960), p. 1021