“To know a thing well, know it's limits; Only when pushed beyond it's tolerance will it's true nature be seen.
-The Amtal Rule”
Source: Children of Dune
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Frank Herbert 158
American writer 1920–1986Related quotes

“The only rules comedy can tolerate are those of taste, and the only limitations those of libel.”
"The Duchess and the Bugs", 'Lanterns & Lances (1961). The piece was "a response" to an award Thurber received from the Ohioana Library Association in 1953.
From Lanterns and Lances

Context: I do not say that I do not know whether this faith is true, or not. I say distinctly and clearly, that I know it is not true. I admit that I do not know whether there is any infinite personality or not, because I do not know that my mind is an absolute standard. But according to my mind, there is no such personality; and according to my mind, it is an infinite absurdity to suppose that there is such an infinite personality. But I do know something of human nature; I do know a little of the history of mankind; and I know enough to know that what is known as the Christian faith, is not true. I am perfectly satisfied, beyond all doubt and beyond all per-adventure, that all miracles are falsehoods. I know as well as I know that I live—that others live—that what you call your faith, is not true.
“To know your limits you need to go beyond them.”
Zire Notes (May 2004 - December 2006)

Twain, Mark - Christian Science: Book I. Chapter V http://www.classicreader.com/book/1286/6/

Answering Josh Mathews' question addressing fan perception that he took advantage of a vulnerable Jeff Hardy and stole the World Heavyweight Championship at Extreme Rules. June 19, 2009.
Friday Night SmackDown

Source: The Subjection of Women (1869), Ch. 1
Context: I deny that anyone knows, or can know, the nature of the two sexes, as long as they have only been seen in their present relation to one another. If men had ever been found in society without women, or women without men, or if there had been a society of men and women in which the women were not under the control of the men, something might have been positively known about the mental and moral differences which may be inherent in the nature of each. What is now called the nature of women is an eminently artificial thing — the result of forced repression in some directions, unnatural stimulation in others.

"3rd Foundational Falsehood of Creationism" https://www.youtube.com/watch?v=fnj7PlqmJ5o, Youtube (December 10, 2007)
Youtube, Foundational Falsehoods of Creationism