“Just Cause: [Learn] not to contradict your father in anything; nor by calling him Iapetus, to reproach him with the ills of age, by which you were reared in your infancy.”
tr. Hickie 1853, vol. 1, Perseus http://www.perseus.tufts.edu/hopper/text.jsp?doc=Aristoph.+Cl.+998
Clouds (423 BC)
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Aristophanés 56
Athenian playwright of Old Comedy -448–-386 BCRelated quotes
“You don't want him for a reason. You want him because he's your father.”

“If you have an enemy, then learn and know your enemy, don't just be mad at him or her”

“Do not to your neighbor what you would take ill from him.”
Fragm. 10.3

Linus Pauling: Scientist and Peacemaker (2001) by Clifford Mead and Thomas Hager.
1990s
Context: When an old and distinguished person speaks to you, listen to him carefully and with respect — but do not believe him. Never put your trust into anything but your own intellect. Your elder, no matter whether he has gray hair or has lost his hair, no matter whether he is a Nobel laureate — may be wrong. The world progresses, year by year, century by century, as the members of the younger generation find out what was wrong among the things that their elders said. So you must always be skeptical — always think for yourself.

Riyadh-as-Saliheen by Imam Al-Nawawi, volume 3, hadith number 471
Sunni Hadith

Riyadh-as-Saliheen by Imam Al-Nawawi, volume 4, hadith number 695
Sunni Hadith

On his work on Our Secret Weapon, as quoted in "Mystery Story Writer Turns Detective, Finding Axis Lies; Rex Stout, Creator of Nero Wolfe, Using Our Secret Weapon — Truth" by Trudi McCullough in The Milwaukee Journal (30 September 1942) http://news.google.com/newspapers?nid=1499&dat=19420930&id=tO4ZAAAAIBAJ&sjid=6SIEAAAAIBAJ&pg=3279,6165010