“Authoritarian, paralyzing, circular, occasionally elliptical, stock phrases, also jocularly referred to as nuggets of wisdom, are malignant plague, one of the very worst ever to ravage the earth. We say to the confused, Know thyself, as if knowing yourself was not the fifth and most difficult of human arithmetical operations, we say to the apathetic, Where there’s a will, there’s a way, as if the brute realities of the world did not amuse themselves each day by turning that phrase on its head, we say to the indecisive, Begin at the beginning, as if that beginning were the clearly visible point of a loosely wound thread and that all we had to do was to keep pulling until we reached the other end, and as if, between the former and the latter, we had held in our hands a smooth, continuous thread with no knots to untie, no snarled to untangle, a complete impossibility in the life of a skien, or indeed, if we may be permitted on more stock phrase, in the skien of life. … These are the delusions of the pure and unprepared, the beginning is never the clear, precise end of a thread, the beginning is a long, painfully slow process that requires time and patience in order to find out in which direction it is heading, a process that feels its way along the path ahead like a blind man the beginning is just the beginning, what came before is nigh on worthless.”

Source: Don Quixote de la Mancha (1605–1615), Part II (1615), Book III, Ch. 42.

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

"Ballad of the Double-Soul"
The Certain Hour (1916)
Context: In the beginning the Gods made man, and fashioned the sky and the sea,
And the earth's fair face for man's dwelling-place, and this was the Gods' decree: — "Lo, We have given to man five wits: he discerneth folly and sin;
He is swift to deride all the world outside, and blind to the world within:
So that man may make sport and amuse Us, in battling for phrases or pelf,
Now that each may know what forebodeth woe to his neighbor, and not to himself."

The Trouble With Being Born (1973)

Source: Remarkable Creatures

[199709242015.NAA10312@wall.org, 1997]
Usenet postings, 1997

critic on the idea of pure Abstract art by Moore
1940 - 1955
Source: 'Unpublished notes' for 'Art and Life', 1941, HMR Archive; as quoted in Henry Moore writings and Conversations, edited by Alan Wilkinson, University of California Press, California 2002, p. 114