1920s, Truth is a Pathless Land (1929) 
Context: I maintain that Truth is a pathless land, and you cannot approach it by any path whatsoever, by any religion, by any sect. That is my point of view, and I adhere to that absolutely and unconditionally. Truth, being limitless, unconditioned, unapproachable by any path whatsoever, cannot be organized; nor should any organization be formed to lead or to coerce people along any particular path. If you first understand that, then you will see how impossible it is to organize a belief. A belief is purely an individual matter, and you cannot and must not organize it. If you do, it becomes dead, crystallized; it becomes a creed, a sect, a religion, to be imposed on others. This is what everyone throughout the world is attempting to do. Truth is narrowed down and made a plaything for those who are weak, for those who are only momentarily discontented. Truth cannot be brought down, rather the individual must make the effort to ascend to it. You cannot bring the mountain-top to the valley. If you would attain to the mountain-top you must pass through the valley, climb the steeps, unafraid of the dangerous precipices.
                                    
“Learners should be allowed to find their own levels and explore the paths leading there with as much and as little guidance as each particular case requires.”
Source: Didactical Phenomenology of Mathematical Structures (1983), p. 47
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Hans Freudenthal 27
Dutch mathematician 1905–1990Related quotes
                                        
                                         "Competition as a crutch" http://sethgodin.typepad.com/seths_blog/2012/07/competition-as-a-crutch.html Seth's Blog (2012-07-16) 
Source: Linchpin: Are You Indispensable?
                                    
Principles of Modern Chemistry (7th ed., 2012), Ch. 5 : Quantum Mechanics and Atomic Structure
Traits and Trials of Early Life (1836)
Source: Systems Design of Education (1991), p. 110
                                        
                                        Community Nutrition Institute v. Block, 749 F.2d 50, 51 (D.C. Cir. 1984) ; decided December 5, 1984. 
1980s
                                    
“Each side should make its own case, but do so without making up its own facts.”
                                        
                                        On claims of waterboarding as being impedimental in as quoted in  "John McCain to Bush apologists: Stop lying about Bin Laden and torture" by Greg Sar in The Washington Post (12 May 2011) http://www.washingtonpost.com/blogs/plum-line/post/john-mccain-to-bush-apologists-stop-lying-about-bin-laden-and-torture/2011/03/03/AF10AnzG_blog.html -  YouTube video of McCaine's speech http://www.youtube.com/watch?v=3I94Yb4KUic 
2010s, 2011 
Context: We did not learn Abu Ahmed’s real name or alias as a result of waterboarding or any "enhanced interrogation technique" used on a detainee in U. S. custody. None of the three detainees who were waterboarded provided Abu Ahmed’s real name, his whereabouts, or an accurate description of his role in Al-Qaeda. … In fact, not only did the use of "enhanced interrogation techniques" on Khalid Sheikh Mohammed not provide us with key leads on bin Laden’s courier, Abu Ahmed; it actually produced false and misleading information. Khalid Sheikh Mohammed specifically told his interrogators that Abu Ahmed had moved to Peshawar, got married, and ceased his role as an Al-Qaeda facilitator — which was not true, as we now know. … It was not torture or cruel, inhuman, and degrading treatment of detainees that got us the major leads that ultimately enabled our intelligence community to find Osama bin Laden. … we are again engaged in this important debate, with much at stake for America’s security and reputation. Each side should make its own case, but do so without making up its own facts.
                                    
https://www.goodreads.com/quotes/9672835-as-our-choices-leads-us-toward-certain-path-so-let-s
“If you can find a path with no obstacles, it probably doesn’t lead anywhere.”
Source: Mud, Sweat, and Tears: The Autobiography