William Blake quote: “In the universe, there are things that are known, and things that are unknown, and in between, there are doors.”

“There are things known
and there are things unknown
and in between are the doors.”

Jim Morrison (1943–1971) lead singer of The Doors

Aldous Huxley, using the term "the doors of perception" which originated with William Blake in The Marriage of Heaven and Hell. It is sometimes credited to Morrison because he cited it in interviews as the inspiration for the name The Doors and without always crediting Huxley as the source.
Misattributed
Variant: There are things known and there are things unknown, and in between are the doors of perception.
Source: Letters from Joe

“There are things known and there are things unknown, and in between are the doors of perception.”

Aldous Huxley (1894–1963) English writer

Aldous Huxley, using the term "the doors of perception" which originated with William Blake in The Marriage of Heaven and Hell. It is sometimes credited to Morrison because he cited it in interviews as the inspiration for the name The Doors and without always crediting Huxley as the source.
Misattributed

“Whether you succeed or not is irrelevant, there is no such thing. Making your unknown known is the important thing--and keeping the unknown always beyond you.”

Georgia O'Keeffe (1887–1986) American artist

Quote in a letter to Sherwood Anderson, October 1923; as quoted in Georgia O'Keeffe: A Life, Roxana Robinson, University Press of New England, 1999
1917 - 1929
Context: I have been thinking of what you say about form... I feel that a real living form is the natural result of the individual’s effort to create the living thing out of the adventure of his spirit into the unknown.... and from that experience comes the desire to make the unknown known. By unknown I mean the thing that means so much to the person that he want to put it down - clarify something he feels but does not clearly understand... Making the unknown known.... if you stop to think of form as form you are lost.

“As long as a thing is unknown, it belongs to us in a way that well-known things do not. For we have the opportunity to fill the empty, unknown spaces for ourselves, and in them there is room for imagination and for hope.”

Cameron Dokey (1956) American writer

“The inclination to seek the truth is safer than the presumption which regards unknown things as known.”

Aurelius Augustinus On the Trinity

(Cambridge: 2002), Book 9, Chapter 1, p. 24
On the Trinity (417)

“Leave the door open for the unknown, the door into the dark. That’s where the most important things come from, where you yourself came from, and where you will go.”

Rebecca Solnit (1961) Author and essayist from United States

Source: A Field Guide to Getting Lost

“Reports that say that something hasn't happened are always interesting to me, because as we know, there are known knowns; there are things we know we know. We also know there are known unknowns; that is to say we know there are some things we do not know. But there are also unknown unknowns — the ones we don't know we don't know. And if one looks throughout the history of our country and other free countries, it is the latter category that tend to be the difficult ones.
The absence of evidence is not evidence of absence, or vice versa.”

Donald Rumsfeld (1932) U.S. Secretary of Defense

Department of Defense news briefing (12 February 2002)
Variant:
Now what is the message there? The message is that there are no "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. So when we do the best we can and we pull all this information together, and we then say well that's basically what we see as the situation, that is really only the known knowns and the known unknowns. And each year, we discover a few more of those unknown unknowns.
:It sounds like a riddle. It isn't a riddle. It is a very serious, important matter.
:There's another way to phrase that and that is that the absence of evidence is not evidence of absence. It is basically saying the same thing in a different way. Simply because you do not have evidence that something exists does not mean that you have evidence that it doesn't exist. And yet almost always, when we make our threat assessments, when we look at the world, we end up basing it on the first two pieces of that puzzle, rather than all three.
:* Extending on his earlier comments in a press conference at NATO Headquarters, Brussels, Belgium (6 June 2002) http://www.nato.int/docu/speech/2002/s020606g.htm
2000s

“I have been thinking of what you say about form... I feel that a real living form is the natural result of the individual’s effort to create the living thing out of the adventure of his spirit into the unknown.... and from that experience comes the desire to make the unknown known. By unknown I mean the thing that means so much to the person that he want to put it down - clarify something he feels but does not clearly understand... Making the unknown known.... if you stop to think of form as form you are lost.”

Georgia O'Keeffe (1887–1986) American artist

Quote in a letter to Sherwood Anderson, October 1923; as quoted in Georgia O'Keeffe: A Life, Roxana Robinson, University Press of New England, 1999
1917 - 1929

“By the help of God and with His precious assistance, I say that Algebra is a scientific art. The objects with which it deals are absolute numbers and measurable quantities which, though themselves unknown, are related to "things" which are known, whereby the determination of the unknown quantities is possible.”

Omar Khayyám (1048–1131) Persian poet, philosopher, mathematician, and astronomer

Treatise on Demonstration of Problems of Algebra (1070).
Context: By the help of God and with His precious assistance, I say that Algebra is a scientific art. The objects with which it deals are absolute numbers and measurable quantities which, though themselves unknown, are related to "things" which are known, whereby the determination of the unknown quantities is possible. Such a thing is either a quantity or a unique relation, which is only determined by careful examination. What one searches for in the algebraic art are the relations which lead from the known to the unknown, to discover which is the object of Algebra as stated above. The perfection of this art consists in knowledge of the scientific method by which one determines numerical and geometric unknowns.

“Some speak of things we know, as new;
And you, of things unknown as things forgot.”

Marianne Moore (1887–1972) American poet and writer

"Quoting an Also Private Thought" (this poem is a very slight reworking of an earlier poem "As Has Been Said")
The Poems of Marianne Moore (2003)

“In the universe, there are things that are known, and things that are unknown, and in between, there are doors.”

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