• Real knowledge is to know the extent of one's ignorance.
  Confucius (551-479 BC) Chinese sage, social philosopher, sponsor of Confucianism, the Chinese state religion, Analects of Confucius [Lunyu] [Selected Sayings] (475 BC-220 AD)

• Knowledge has three degrees – opinion, science, illumination.
  • The means or instrument of the first is sense;
  • of the second, dialectic;
  • of the third, intuition.

• A truth which comes to us from outside always bears the stamp of uncertainty. We can believe only what appears to each one of us in our hearts. […]
  We no longer want merely to believe; we want to know. Belief demands the acceptance of truths which we do not ful-
  ly comprehend. But things we do not fully comprehend are repugnant to the individual element in us, which wants to experience everything in the depths of its inner being. The only knowledge which satisfies us is one which is subject
  to no external standards but springs from the inner life of the personality. Rudolf Steiner (1861-1925) Croation-born Aus-
  trian cultural philosopher, architect, literary critic, social reformer, mystic esotericist, founder of anthroposophy, author, fundamental philosophical work The Philosophy of Freedom, "Preface", S. 27-28, German original, 1894, revised ediition 1918

• Knowledge is our asset to understand things as it is. […] 
  All knowledge is from the outside [out of books, listening, looking].
  Knowledge is essentially anchored in materialism. […]
  Knowledge for the most part is passing.
  Knowledge is valuable only to the degree that it can be ensouled, that it can be enriched to become meaningful, to stand for something that will help to enhance the general state of mankind.

• Common sense is just natural honesty. It is an intuitive grasp of realities and it is probably the most powerful educating force that there is and yet we don’t dare to trust it because common sense may teach us to go in the
  opposite direction from which we are heading.
  "The Wisdom Series" lecture by Manly Palmer Hall (1901-1990) Canadian-born mystic, occultist, 33rd degree Freemason,
  author, From Knowledge to Wisdom, YouTube film, minute 27:21, 58:41 minutes duration, posted 26. April 2013

• We have to be able to recognize that the attainment of knowledge is the highest labor of mankind. And that the
  attainment of knowledge is the basis of all philanthropy, the basis of all unselfishness, the basis of all cooperation,
  and the strengthening of all the constructive emotions of the human being. Therefore to do this, it must be a disci-
  pline. And all ancient people set aside certain disciplines for those who wanted to know the truth more than anything else. These they called the mystery schools. The greatest of all wisdom is the love of truth, the love of reality. We've had years of years of corrupted wisdom. We've had years of years of pseudo knowledge and we're now very much
  in need of the real thing.
  Lecture by Manly Palmer Hall (1901-1990) Canadian-born mystic, occultist, 33rd degree Freemason, author, From Knowledge
  to Wisdom, "The Wisdom Series", YouTube film, minute 41:06, 58:41 minutes duration, posted 26. April 2013

• Imagination is more important than knowledge. For Imagination knowledge is limited, whereas imagination em-
  braces the entire world, stimulating progress, giving birth to evolution.
  Albert Einstein (1879-1955) German-born US American theoretical physicist, developer of the theory of general relativity, Nobel laureate in physics, 1921, Viereck interview "What Life Means to Einstein'', presented by the US American magazine The Saturday Evening Post, interviewer George Sylvester Viereck, S. 17, 26. October 1929

• Logic will get you from A to B. Imagination will take you everywhere.
  Albert Einstein (1879-1955) German-born US American theoretical physicist, developer of the theory of general relativity, Nobel laureate in physics, 1921, cited in: Goodreads Quotable Quote

• Instinct is something which transcends knowledge. We have undoubtedly certain finer fibers that enable us to
  perceive truths when logical deduction or any other willful effort of the brain is futile.
  Nikola Tesla (1856-1943) Serbian US American physicist, mechanical and electrical engineer, inventor, cited in: article
  My Inventions, presented by the US American magazine The Electrical Experimenter, 1919

• The desire of power in excess caused the angels to fall; the desire of knowledge in excess caused man to fall.
  Francis Bacon (1561-1626) English philosopher, statesman, scientist, lawyer, jurist, author, pioneer of the scientific method,
  cited in: Quotefancy

• Wisdom means having knowledge and knowing how and when to use it.
  Wisdom may include common sense; but it depends upon the uncommon sense of the divine in the present moment. Michael Meade Mosaicvoices.org US American storyteller, mythologist, ritualist, spokesman in the men's movement, author, Facebook comment, 12. November 2016

• Thoughts [concepts] without content are empty, intuitions without concepts are blind. The understanding can intuit nothing, the senses can think nothing. Only through their unison can knowledge arise. Immanuel Kant (1724-1804) German philosopher at the end of the 18th century Enlightenment, Critique of Pure Reason [Kritik der reinen Vernunft], A 51,
  B 75, 1st edition 1781, 2nd edition 1787

• [T]o teach pride in knowledge is to put up an effective barrier against any advance upon what is already known,
  since it makes one ashamed to look beyond the bounds imposed by one's own ignorance. George Spencer-Brown
  (1923-2016) British polymath, educative mathematician, songwriter, poet, Laws of Form, Appendix 1, 1969

• Not ignorance, but ignorance of ignorance, is the death of knowledge.
  Alfred North Whitehead (1861-1947) English mathematician, philosopher, pioneering integralist, metaphysical educator, author, unsourced quote, cited in: Goodreads Quotable Quote

• In the life of man,
  • his time is but a moment,
  • his being an incessant flux,
  • his senses a dim rushlight,
  • his body a prey of worms,
  • his soul an unquiet eddy,
  • his fortune dark,
  • and his fame doubtful.

• The only way in which a human being can make some approach to knowing the whole of a subject, is by hearing
  what can be said about it by persons of every variety of opinion, and studying all modes in which it can be looked
  at by every character of mind. John Stuart Mill (1806-1873) English philosopher, economist, On Liberty, 1859

• Knowledge is about information, wisdom is about transformation.
  Tal Ben-Shahar, Ph.D. (*1970) US American organizational behaviorist, lecturer on positive psychology and leadership, Harvard University, Boston, faculty of the Interdisciplinary Center (IDC), Herzliya, Israel, writer, 3rd annual Positive Psychology course, Harvard University, Cambridge, Massachusetts, 2008, lecture 1 Positive Psychology, YouKu film, 77:03 minutes duration, posted October 2008

• Knowing something is probably an obsolete idea. You don't actually need to know anything, you can find out at the
  point when you need to know it. It's the teacher's job to point young minds towards the right kind of question. A
  teacher doesn't need to give any answers, because answers are everywhere. And we know now from years of
  measurements that learners who find the answers for themselves retain it better than if they're told the answer.
  Sugata Mitra (*1952) Indian polymath, professor of educational technology, School of Education, Communication and Language Sciences, Newcastle University, England, cited in: educational documentary The Future of Learning, presented by Ericsson – Networked Society, YouTube film, minute 3:50, 20:17 minutes duration, posted 19. October 2012, reposted 17. April 2021

• Tacit knowledge is the most important knowledge in a rapidly changing world. That tacit knowledge is embedded in people. If you are not having unex-
  pected encounters with people you are not going to have unexpected encounters with this tacit knowledge. That's the power of the social networks as they start to focus on connecting people. […] Because it's so hard hard to express tacit knowledge I'm typically going to hold back […] unless there is some kind of trust-based relationship there. John Hagel III, US American consultant, co-chairman of the Deloitte Center for the Edge, speaker and author on the intersection of business strategy and information technology, John Hagel – Real Time Web, part 2 of 3, presented by O'Reilly radar, host Joshua-Michéle Ross, minute 4:26 5:18 minutes duration, 24. October 2009

• In Phase I [illusion] of the human experience: Knowledge is power.
  In Phase II [truth] of the human experience: Knowledge has no power. However, it is supportive.
  Robert Scheinfeld, US American bestselling author, reference: Scheinfield-Drilling-Tools, PDF, undated

• Knowledge is power. – Scientia potentia est Latin aphorism, falsely attributed to Francis Bacon (1561-1626) English philosopher, statesman, scientist, lawyer, jurist, author, pioneer of the scientific method

• Knowledge is gained by learning; trust by doubt; skill by practice; and love by love. Thomas S. Szasz (1920-2012) Hungarian US-American professor emeritus of psychiatry, psychoanalyst, social critic of the moral and scientific foundations of psychiatry and scientism, author, Words to the Wise. A Medical-Philosophical Dictionary, S. 139, Transaction Publishers, 2004

• Whenever masses of people, especially educated people, know something – and when what they know is some-
  thing they greatly fear because they believe it affects virtually everything they do or want to do – then most likely we
  stand in the presence of a vast falsehood. Thomas S. Szasz (1920-2012) Hungarian US-American professor emeritus of psychiatry, psychoanalyst, social critic of the moral and scientific foundations of psychiatry and scientism, author, Insanity. The Idea and Its Consequences, S. 11, First Syracuse University Press, 1997

• The world is more complex than we can imagine, and every new point of view we encounter can enrich our understanding even if we don't embrace it entirely. But this comes with the risk of self-effacement and growing uncertainty. Imagine that you are standing in a small clearing in the middle of a vast forest, and that this forest represents your ignorance of the world. The clearing you stand in represents your knowledge. As one gains knowledge, the clearing expands and the forest of ignorance recedes. But as the clearing expands, so does its circumference and so the area of contact bet-
  ween knowledge and ignorance also grows, and our knowledge of the extent of our ignorance grows with it. So, pa-
  radoxically, the wiser we become, the less wise we feel. This is the wellspring of intellectual humility, the Socratic realization that the more you know, the more you realize you don’t know, and the more apparent it becomes that
  your own opinions are susceptible to fallibility. Article The Psychology of Progressive Hostility, presented by the Australian online magazine on science, technology, news, culture, and politics Quillette, Matthew Blackwell, 19. March 2018

• Every day that we read the news we have the possibility of being confronted with a fact about our world that is wildly different from what we thought we knew. Samuel Arbesman, US American complexity scientist, The Half-Life of Facts. Why Everything We Know Has an Expiration Date, Penguin Publishing Group, Current, reprint edition 27. August 2013

• Simkin and Roychowdhury conclude, using some elegant math, that only about 20 percent of scientists who cite an article have actually read that paper. This means that four out of five scientists never take the time to track down a publication they intend to use to buttress their arguments. By examining these mutations we can trace these errors backward in time, and understand how knowledge truly spread from scientist to scientist, instead of how it appeared
  to spread. Samuel Arbesman, US American complexity scientist, The Half-Life of Facts. Why Everything We Know Has an
  Expiration Date, Penguin Publishing Group, Current, reprint edition 27. August 2013

On the techniques used by tribal peoples from various places around the world
to store, retrieve and teach knowledge essential to survival.

• All people, literate and non-literate, possess curiosity, intellect, and a love of knowledge for knowledge's sake.
  Lynne Kelly (*1951) Australian researcher, science educator, writer, The Memory Code. The Secrets of Stonehenge, Easter
  Island and Other Ancient Monuments, 22. June 2016, Pegasus Books, 7. February 2017

• There are known knowns; there are things we know that we know.
  There are known unknowns; that is to say, there are things that we now know we don't know.
  But there are also unknown unknowns – there are things we do not know we don't know.
  ⚡ Donald Rumsfeld [Mr. Monsanto] (1932-1921) US American politician, businessman, 13th secretary of defense (1975-1977),
  21st secretary of defense (2001-2006), convicted war criminal, press briefing, 12. February 2002