“The search of reason ends at the shore of the known.”

[Alan, Dershowitz, http://online.wsj.com/article/SB10001424052702303544604576429783247016492.html?mod=WSJ_Opinion_LEADTop, Casey Anthony: The System Worked, The Wall Street Journal, July 7, 2011, July 7, 2011] published 2011-07-07

Brown v. Allen, 344 U.S. 443, 537 (1953) (concurring)
Judicial opinions

Fiction, Hypnos (1922)
Context: That was the end of our voluntary searchings in the caverns of dream. Awed, shaken, and portentous, my friend who had been beyond the barrier warned me that we must never venture within those realms again.

Part I, Question 1, Article 1; tr. Fathers of the English Dominican Province (1920, New York: Benziger Bros.)
Summa Theologica (1265–1274)

Quoted in Introduction by Terry Newland
Mind is a Myth (1987)
Context: I have assumed that the goal, enlightenment, exists. I have had to search and it is the search itself which has been choking me and keeping me out of my natural state. There is no such thing as spiritual or psychological enlightenment because there is no such thing as spirit or psyche. I have been a damn fool all my life, searching for something which does not exist. My search is at an end.

Source: 2010s, 2013, Things That Matter: Three Decades of Passions, Pastimes and Politics (2013), Chapter 14 : The Age of Holy Terror, "September 11, 2001"
"To War, Not to Court" in The Washington Post (12 September 2001) https://www.washingtonpost.com/archive/opinions/2001/09/12/to-war-not-to-court/86d5f7a6-b901-4a70-93be-01e718471169<!-- also "This is Not Crime, This is War" http://townhall.com/columnists/charleskrauthammer/2001/09/12/this_is_not_crime,_this_is_war -->
Context: We no longer have to search for a name for the post-Cold War era. It will henceforth be known as the age of terrorism. Organized terror has shown what it can do; execute the single greatest massacre in American history, shut down the greatest power on the globe and send its leaders into underground shelters. All this, without even resorting to chemical, biological or nuclear weapons of mass destruction. This is a formidable enemy. To dismiss it as a bunch of cowards perpetrating senseless acts of violence is complacent nonsense. People willing to kill thousands of innocents while they kill themselves are not cowards. They are deadly, vicious warriors and need to be treated as such. Nor are their acts of violence senseless. They have a very specific aim: to avenge alleged historical wrongs and to bring the great American satan to its knees.

Source: Tell-All