Quotes About Logic

The example of syllogism that he had learned in Kiseveter's logic - Caius is a man, men are mortal, therefore Caius is mortal - had seemed to him all his life correct only as regards Caius, but not at all as regards himself. In that case it was a question of Caius, a man, an abstract man, and it was perfectly true, but he was not Caius, and was not an abstract man.

Dac? ar fi s? admitem c? via?a omului poate fi condus? numai de ra?iune, atunci s-ar nimic îns??i posibilitatea vie?ii.

If we admit that human life can be ruled by reason, the possibility of life is destroyed.

either the war is insanity, or the people, if they do this insanity, aren't not at all reasonable creatures, as some might , for some reason, think.

Sviazhsky was one of those people, always a source of wonder to Levin, whose convictions, very logical though never original, go one way by themselves, while their life, exceedingly definite and firm in its direction, goes its way quite apart and almost always in direct contradiction to their convictions.

Man must not check reason by tradition, but contrariwise, must check tradition by reason.

If the conception of freedom appears to reason a senseless contradiction, like the possibility of performing two actions at one and the same instant of time, or of an effect without a cause, that only proves that consciousness is not subject to reason.

Goethe says: truth repels, but delusion attracts, because truth presents us as limited, while delusion presents us as omnipotent. Moreover, truth repels because it is fragmented and incomprehensible, while delusion is coherent and logical.

Caio é um homem,os homens são mortais, logo Caio é mortal", parecera-lhe a vida toda muito lógico e natural se aplicado a Caio, mas certamente não quando aplicado a ele próprio.

Once admit that human life can be guided by reason, and all possibility of life is annihilated.

A man with a conviction is a hard man to change. Tell him you disagree and he turns away. Show him facts or figures and he questions your sources. Appeal to logic and he fails to see your point.

The physicists defer only to mathematicians, and the mathematicians defer only to God.

The physicists defer only to the mathematicians, and the mathematicians defer only to God.

Logic, order, truth, reason, we consign them all to the oblivion of death," said one Surrealist manifesto. We must "cultivate the hatred of intelligence," said the leader of the Futurists, Filippo Marinetti, an artist hailed by Mussolini as the John the Baptist of Fascism.17

The principles of morality are a product not of feeling, but of cognition.

Statism and the advocacy of reason are philosophical opposites. They cannot coexist—neither in a philosophic system nor in a nation.

The victim's submission to utter senselessness becomes the defeat of sense. His obeisance to absurdity becomes the refutation of logic.

When the hammer of logic and the fire of human zeal fail to open the stony heart, unction will succeed.

Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.

Common sense is that which judges the things given to it by other senses.

È sempre difficile che l'ovvio e il sensato entrino in un processo.

Logic is the foundation of the certainty of all the knowledge we acquire.

The kind of knowledge which is supported only by observations and is not yet proved must be carefully distinguished from the truth; it is gained by induction, as we usually say. Yet we have seen cases in which mere induction led to error.

He did not dissociate his thought from himself; he thought integrally, with the whole of his body; and each logical deduction forthwith became real to him—as happens only with very healthy or direct persons who have not yet turned thought into a pastime.