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If we accept values as given and constant, if we postulate an objective description of the world as it really is, and if we assume that the decisionmaker's computational powers are unlimited then two important consequences follow. First we do not need to distinguish between the real world and the decisionmaker's perception of it: he or she perceives the world as it really is. Second we can predict the choices that will be made by a rational decisionmaker entirely from our knowledge of the real world and without a knowledge of the decisionmaker's perceptions or modes of calculation (we do, of course, have to know his or her utility function).
--
Simon (1986, p. 210) as cited in: Douglass C. North (1993). "New Institutional Economics and Development". Working paper

 

Herbert Simon

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[M]any people would accept that we do not really have knowledge of the world; we have knowledge only of our representations of the world. Yet we seem condemned by our consitution to treat these representations as if they were the world, for our everyday experience feels as if it were of a given and immediate world.

 

Francisco Varela

 

How both the objective world accommodates to presentations in us, and presentations in us to the objective world, is unintelligible unless between the two worlds, the ideal and the real, there exists a pre-determined harmony. But this latter is itself unthinkable unless the activity, whereby the objective world, is produced, is at bottom identical with that which expresses itself in volition, and vice versa.

 

Friedrich Schelling

 

In the name of the best within you, do not sacrifice this world to those who are its worst. In the name of the values that keep you alive, do not let your vision of man be distorted by the ugly, the cowardly, the mindless in those who have never achieved his title. Do not lose your knowledge that man's proper estate is an upright posture, an intransigent mind and a step that travels unlimited roads. Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the approximate, the not-quite, the not-yet, the not-at-all. Do not let the hero in your soul perish, in lonely frustration for the life you deserved, but have never been able to reach. Check your road and the nature of your battle. The world you desired can be won, it exists, it is real, it is possible, it's yours.

 

Ayn Rand

 

You know the real world, this so-called real world, is just something you put up with. Like everybody else. I’m in my element when I am a little bit out of this world. Then I’m in the real world – I’m on the beam. Because when I’m falling, I’m doing all right. When I’m slipping, I say: he, this is interesting. It’s when I’m standing upright that bothers me.

 

Willem de Kooning

 

The restoration of our world-view can come only as a result of inexorably truth-loving and recklessly courageous thought. Such thinking alone is mature enough to learn by experience how the rational, when it thinks itself out to a conclusion, passes necessarily over into the non-rational. World- and life-affirmation and ethics are non-rational. They are not justified by any corresponding knowledge of the nature of the world, but are the disposition in which, through the inner compulsion of our will-to-live, we determine our relation to the world.
What the activity of this disposition of ours means in the evolution of the world, we do not know. Nor can we regulate this activity from outside; we must leave entirely to each individual its shaping and its extension. From every point of view, then, world- and life-affirmation and ethics are non-rational, and we must have the courage to admit it.

 

Albert Schweitzer