“If rational thought thinks itself out to a conclusion, it arrives at something non-rational which, nevertheless, is a necessity of thought. This is the paradox which dominates our spiritual life. If we try to get on without this non-rational element, there result views of the world and of life which have neither vitality nor value.”

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics

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Albert Schweitzer126

French-German physician, theologian, musician and philosoph… 1875–1965

James Rachels (1941–2003) American philosopher

Created from Animals: The Moral Implications of Darwinism (1990), p. 5

“If philosophy aims at being a theoretical mode of thought and speech, can it have a rhetorical character and be expressed in rhetorical forms? The answer seems obvious. Theoretical thinking, as a rational process, excludes every rhetorical element because pathetic influences—the influences of feeling—disturb the clarity of rational thought. …
To prove means to show something to be something, on the basis of something. To have something through which something is shown and explained definitively is the foundation of our knowledge. Apodictic, demonstrative speech is the kind of speech which establishes the definition of a phenomenon by tracing it back to ultimate principles, or archai. It is clear that the first archai of any proof and hence of knowledge cannot be proved themselves because they cannot be the object of apodictic, demonstrative, logical speech; otherwise they would not be the first assertions. Their nonderivable, primary character is evident from the fact that we neither can speak nor comport ourselves without them, for both speech and human activity simply presuppose them. But if the original assertions are not demonstrable, what is the character of the speech in which we express them? Obviously this type of speech cannot have a rational-theoretical character….
Basic premises cannot have an apodictic, demonstrative character and structure but are thoroughly indicative….
Arche … cannot have a rational but only a rhetorical character. Thus the term "rhetoric" assumes a fundamentally new significance; "rhetoric" is not, nor can it be the art, the technique of an exterior persuasion; it is rather the speech which is the basis of the rational thought.”

Ernesto Grassi (1902–1991) Italian philosopher

Source: Rhetoric as Philosophy (1980), pp. 18-19

“The premise of this statement is what one might call the principle of non-indirection. I call “indirection” an indirect operation that makes it possible to arrive at a certain result through two successive actions, the first of which serves only to make the second possible. … This principle is not limited to rational actions. … The principle of non-indirection thus expresses a broader idea of coherence that includes the emotional as well as the rational.”

Jon Elster (1940) Norwegian academic

Reason and Rationality (2009)

“The outcome of a non-constant-sum game may be dictated by the individual rationality of the respective players without satisfying a criterion of collective rationality.”

Anatol Rapoport (1911–2007) Russian-born American mathematical psychologist

Anatol Rapoport. (1974). Game Theory as a Theory of Conflict Resolution p. 4
1970s and later

“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 (1875–1965) French-German physician, theologian, musician and philosopher

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics
Context: 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.

“As conceived in this book, economics is the science of rational choice in a world─our world─in which resources are limited in relation to human wants. The task of economics, so defined, is to explore the implications of assuming that man is a rational maximizer of his ends in life, his satisfactions─what we shall call his “self-interest.” Rational maximization should not be confused with conscious calculation. Economics is not a thoery about consciousness. Behavior is rational when it conforms to the model of rational choice, whatever the state of mind of the chooser.(…) Nor is perfect rationality assumed; rational-choice thoery allows us to assume that rationality is “bounded” because of human cognitive limitations, although another way to think of those limitations is as costs of absorbing and using information.”

Richard A. Posner (1939) United States federal judge

Source: Economic Analysis of Law (7th ed., 2007), Ch. 1: The Nature of Economic Reasoning

“For in world- and life-affirmation and in ethics I carry out the will of the universal will-to-live which reveals itself in me. I live my life in God, in the mysterious divine personality which I do not know as such in the world, but only experience as mysterious Will within myself.
Rational thinking which is free from assumptions ends therefore in mysticism.”

Albert Schweitzer (1875–1965) French-German physician, theologian, musician and philosopher

Kulturphilosophie (1923), Vol. 2 : Civilization and Ethics
Context: Affirmation of the world, which means affirmation of the will-to-live that manifests itself around me, is only possible if I devote myself to other life. From an inner necessity, I exert myself in producing values and practising ethics in the world and on the world even though I do not understand the meaning of the world. For in world- and life-affirmation and in ethics I carry out the will of the universal will-to-live which reveals itself in me. I live my life in God, in the mysterious divine personality which I do not know as such in the world, but only experience as mysterious Will within myself.
Rational thinking which is free from assumptions ends therefore in mysticism. To relate oneself in the spirit of reverence for life to the multiform manifestations of the will-to-live which together constitute the world is ethical mysticism. All profound world-view is mysticism, the essence of which is just this: that out of my unsophisticated and naïve existence in the world there comes, as a result of thought about self and the world, spiritual self-devotion to the mysterious infinite Will which is continuously manifested in the universe.

“Yes perhaps, as the Sage says, "nothing worthy of proving can be proven, nor yet disproven"; but can we restrain that instinct which urges man to wish to know, and above all to wish to know the things which conduce to life, to eternal life? Eternal life, not eternal knowledge as the Alexandrian gnostic said. For living is one thing and knowing is another; and… perhaps there is an opposition between the two that we may say that everything vital is anti-rational, not merely irrational, and that everything rational is anti-vital. And this is the basis of the tragic sense of life.”

Miguel de Unamuno (1864–1936) 19th-20th century Spanish writer and philosopher

The Tragic Sense of Life (1913), II : The Starting-Point

“Capitalists control the machineries. They create difficulties to the workers. Consequently rationalism, which has to lead the way for peaceful life to all, has resulted in causing poverty and worries to the people because of dominating forces”

Periyar E. V. Ramasamy (1879–1973) Tamil politician and social reformer

Quoted in “Collected works of Periyar E.V.R.” p. 511.
Rationalism

“The economic doctrine of Adam Smith is the doctrine of Mandeville set out in a form which is no longer paradoxical and literary, but rational and scientific.”

Bernard Mandeville (1670–1733) Anglo-Dutch writer and physician

La doctrine économique d'Adam Smith, c'est la doctrine de Mandeville, exposée sous une forme non plus paradoxale et littéraire, mais rationnelle et scientifique.
Élie Halévy La formation du radicalisme philosophique (Paris: F. Alcan, 1901-4) vol. 1, p. 162; Mary Morris (trans.) The Growth of Philosophic Radicalism (Clifton, N.J.: A. M. Kelley, 1972) p. 90.
Criticism

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