Deductive Logic Quotes

I am delighted to know that Principia Mathematica can now be done by machinery ... I am quite willing to believe that anything in deductive logic can be done by machinery. ~ Bertrand Russell

Theologians, and religionists in general, start with a fantasy premise and then proceed to apply rigorous formal logic to tease out its implications. Stark himself points out that "theology consists of formal reasoning about God." This is admirably exact. Theologians, beginning with a wished-for creation of their own minds, analyze that creation's characteristics by rigorous application of the principles of formal - that is, deductive - logic. ~ Andrew Bernstein

The word 'proof' should strictly only be used when we are dealing with deductive inferences.... Popper claimed that scientists only need to use deductive inferences.... So if a scientist is only interested in demonstrating that a given theory is false, she may be able to accomplish her goal without the use of inductive inferences.... When a scientist collects experimental data, her aim might be to show that a particular theory...is false. She will have to resort to inductive reasoning.... So Popper's attempt to show that science can get by without induction does not succeed. ~ Samir Okasha

Without deductive logic science would be entirely useless. It is merely a barren game to ascend from the particular to the general, unless afterwards we can reverse the process and descend from the general to the particular, ascending and descending like angels on Jacob's ladder. ~ Alfred North Whitehead

Everything must be taken into account. If the fact will not fit the theory
let the theory go. ~ Agatha Christie

And human instinct is ancient and reliable, utterly mysterious and possibly capable of great genius. I believe that refined, fluent instincts are a person's most valuable asset. My own instincts have repeatedly guided me against the grain of logic and probability. When I have trusted and followed their direction, they have never been wrong. I don't know how or why. But I know that every significant experience-positive or negative-sharpens them and makes them more accurate. ~ Augusten Burroughs

It's a fool that looks for logic in the chambers of the human heart. ~ Joel Coen

Schools train people to be ignorant, with style. They give you the equipment that you need to be a functional ignoramus. American schools* do not equip you to deal with things like logic; they don't give you the criteria by which to judge between good and bad in any medium or format; and they prepare you to be a usable victim for military-industrial complex that needs manpower. ~ Frank Zappa

Some things are governed by common sense. Putting buttons on the front of a shirt is a matter of logic, since it would be very difficult to button them up at the side, and impossible if they were at the back.
Other things, however, become fixed because more and more people believe that's the way they should be. I'll give you two examples. Have you ever wondered why the keys on a typewriter are arranged in that particular order? ~ Paulo Coelho

There is no such thing as magic, supernatural, miracle;
only something that's still beyond logic of the observer. ~ Toba Beta

Peace is a flawed logic. They believe that communication and understanding will create peace. However, just because you know and understand the nature of something or someone, does not mean that you will come to terms. ~ Lionel Suggs

Men cooperate with one another. The totality of interhuman relations engendered by such cooperation is called society. Society is not an entity in itself. It is an aspect of human action. It does not exist or live outside of the conduct of people. It is an orientation of human action. Society neither thinks nor acts. Individuais in thinking and acting constitute a complex of relations and facts that are called social relations and facts.
The issue has been confused by an arithmetical metaphor. Is society, people asked, merely a sum of individuals or is it more than this and thereby an entity endowed with independent reality? The question is nonsensical. Society is neither the sum of individuais nor more nor less. Arithmetical concepts cannot be applied to the matter.
Another confusion arises from the no less empty question whether society is - in logic and in time - anterior to individuais or not. The evolution of society and that of civilization were not two distinct processes but one and the same process. The biological passing of a species of primates beyond the levei of a mere animal existence and their transformation into primitive men implied already the development of the first rudiments of social cooperation. Homo sapiens appeared on the stage of earthly events neither as a solitary foodseeker nor as a member of a gregarious flock, but as a being consciously cooperating with other beings of his own kind. Only in cooperation with his fellows could he develop ~ Ludwig Von Mises

You can win more arguments then you might think as a writer, even though you legally have no recourse, and your script can get muddied and altered in any way possible. You can use reason, logic, and passion to argue persuasively for a case in your favor. ~ Shane Black

Capitalism is neither a person nor an institution. It neither wills nor chooses. It is a logic at work through a mode of production: a blind, obstinate logic of accumulation. ~ Michel Beaud

If god wanted people to believe in him, why'd he invent logic then? ~ David Feherty

● The wounds cannot heal unless they are open.

● Once something unconscious is brought to the conscious mind, it evaporates.

● You come in contact with so many people, and everybody is feeding his idea into your mind. And nobody knows you - not even you yourself know.

● Before a child becomes aware of what is real, he has been taught to suppress it.

● If you want to have a very secure relationship, then you will have to love a dead man.

● One has to understand the logic of the mind. If you don't understand, you will be a victim of it.

● You want to be loved, but you have not thought about it: Are you capable of receiving love? ~ Osho

Likewise, if Kafka wants to express the absurd, he will make use of consistency. You know the story of the crazy man who was fishing in a bathtub. A doctor with ideas as to psychiatric treatments asked him 'if they were biting', to which he received the harsh reply: 'Of course not, you fool, since this is a bathtub.' That story belongs to the baroque type. But in it can be grasped quite clearly to what a degree the absurd effect is linked to an excess of logic. Kafka's world is in truth an indescribable universe in which man allows himself the tormenting luxury of fishing in a bathtub, knowing that nothing can come of it. ~ Albert Camus

To the scientific mind, such phenomena as symbolic ideas are most irritating, because they cannot be formulated in a way that satisfies our intellect and logic. ~ C. G. Jung

What you call intelligence and what you refer to as the Creator are not different. The Creator is pure intelligence, intelligence beyond logic. ~ Jaggi Vasudev

I never thought that others would take my theories so much more seriously than I did. ~ Albert Einstein

Logic and loss aren't always great friends. Sometimes we mourn for the things that hurt us. Sometimes, that's okay. ~ Seanan McGuire

There's a cellular automaton called TVC. After Turing, von Neumann and Chiang. Chiang's version was N-dimensional. That leaves plenty of room for data within easy reach. In two dimensions, the original von Neumann machine had to reach further and further - and wait longer and longer - for each successive bit of data. In a six-dimensional TVC automaton, you can have a three-dimensional grid of computers, which keeps on growing indefinitely - each with its own three-dimensional memory, which can also grow without bound.

And when the simulated TVC universe being run on the physical computer is suddenly shut down, the best explanation for what I've witnessed will be a continuation of that universe - an extension made out of dust. Maria could almost see it: a vast lattice of computers, a seed of order in a sea of random noise, extending itself from moment to moment by sheer force of internal logic, "accreting" the necessary building blocks from the chaos of non-space-time by the very act of defining space and time. ~ Greg Egan

Consider a cognitive scientist concerned with the empirical study of the mind, especially the cognitive unconscious, and ultimately committed to understanding the mind in terms of the brain and its neural structure. To such a scientist of the mind, Anglo-American approaches to the philosophy of mind and language of the sort discussed above seem odd indeed. The brain uses neurons, not languagelike symbols. Neural computation works by real-time spreading activation, which is neither akin to prooflike deductions in a mathematical
logic, nor like disembodied algorithms in classical artificial intelligence, nor like derivations in a transformational grammar. ~ George Lakoff

The logic of the poet - that is, the logic of language or the experience itself - develops the way a living organism grows: it spreads out towards what it loves, and is heliotropic, like a plant. ~ Thomas Merton

In this world are very few things made from logic alone. It is illogical for man to be too logical. Some things we must just let stand. The mystery is more important than any possible explanation. The searcher after truth must search with humanity. Ruthless logic is the sign of a limited mind. The truth can only add to the sum of what you know, while a harmless mystery left unexplored often adds to the meaning of life. When a truth is not so important, it is better left as a mystery. ~ Bryce Courtenay

Intellect is limited, but it has one great merit; it can recognise its limits! ~ Raheel Farooq

What we know of as logical is actually the most illogical thing in the universe. ~ Meir Ezra

On one side of his brain, logic was standing on a chair, waving its arms to get his attention. On the other side, lust and yearning rubbed their hands together in unholy anticipation. ~ Joanna Shupe

When the anarchist, as the mouthpiece of the declining levels of society, insists on 'right,' 'justice,' 'equal rights' with such beautiful indignation, he is just acting under the pressure of his lack of culture, which cannot grasp why he really suffers, what he is poor in– in life.

A drive to find causes is powerful in him: it must be somebody's fault that he's feeling bad . . . Even his 'beautiful indignation' does him good; all poor devils like to whine--it gives them a little thrill of power. Even complaints, the act of complaining, can give life the charm on account of which one can stand to live it: there is a subtle dose of revenge in every complaint; one blames those who are different for one's own feeling bad, and in certain circumstances even being bad, as if they were guilty of an injustice, a prohibited privilege. 'If I'm a lowlife, you should be one too': on this logic, revolutions are built.–

Complaining is never good for anything; it comes from weakness. Whether one ascribes one's feeling bad to others or to oneself–the socialist does the former, the Christian, for example, the latter–makes no real difference. What is common to both and, let us add, what is unworthy, is that it should be someone's fault that one is suffering–in short, that the sufferer prescribes the honey of revenge as a cure for his own suffering. ~ Friedrich Nietzsche

What's beyond logic happens beneath will;
nor can these moments be translated: i say
that even after April
by God there is no excuse for May ~ E. E. Cummings

Present us with a silver cup for something when you're a filthy rich lawyer, I dare say? Yes. You'll be a lawyer. Magnificent memory. Sense of logic, no imagination and no brains. ~ Jane Gardam

I believe that knowing when to leave one's employer is a critical success factor in building a career, assuming that the logic behind one's decision makes some sense. ~ Catherine Fredman

I watched as Humphrey Bogart's character used beans as a metaphor for the relative unimportance in the wider world of his relationship with Ingrid Bergman's character, and chose logic and decency ahead of his selfish emotional desires. The quandary and resulting decision made for an engrossing film. But this was not what people cried about. They were in love and could not be together. I repeated this statement to myself, trying to force an emotional reaction. I couldn't. I didn't care. I had enough problems of my own. ~ Graeme Simsion

I hesitated for just a moment. Some part of me wanted to see the creature, after having heard it for so many days. Was it the remnants of the scientist in me, trying to regroup, trying to apply logic when all that mattered was survival? If so, it was a very small part. I ran. ~ Jeff VanderMeer

From the point of view of pure logic or philosophy, there will often be a dialectical tension between two concepts.
For example ...
If I reflect on the concept of 'being,' I will be obliged to introduce the opposite concept, that of 'nothing.' You can't reflect on your existence without immediately realizing that you won't always exist. The tension between 'being' and 'nothing' becomes resolved in the concept of 'becoming.' Because if something is in the process of becoming, it both is and is not. ~ Jostein Gaarder

The belief of God is not a matter of common sense, or logic, or argument, but of feeling. It is as impossible to prove the existence of God as to disprove it. I do not believe in God. I see no need of such an idea. It is incredible to me that there should be an after-life. I find the notion of future punishment outrageous and of future reward extravagant. I am convinced that when I die, I shall cease entirely to live; I shall return to the earth I came from. Yet I can imagine that at some future date I may believe in God; but it will be as now, when I don't believe in Him, not a matter of reasoning or of observation, but only of feeling. ~ W. Somerset Maugham

... for although people can be made worse off by all other gifts, correct reasoning alone can only be for the good. ~ Gottfried Wilhelm Leibniz

In the irresistible logic of guilt, one evil leads to another, one sin is developed out of another. There is nothing abrupt, nothing casual in the process. The road to sin is smooth, because an army of transgressions has passed over it. When such a development takes place, the community is filled with consternation. Men meet each other and say, "Have you heard what has happened? Mr. A. has turned out a defaulter. Mr. B. has been robbing his bank. How could he have done it?" Alas! he did it long ago, when he took the first step, when he diverged a very little way from the path of right. After that, every other step was easy, natural, and logical. ~ James Clarke

It is said that the human brain divides its functions. The right brain is devoted to sensory impressions, emotions, colors, music. The left brain deals with abstract thought, logic, philosophy, analysis.
My definition of a great movie: While you're watching it, it engages your right brain. When it's over, it engages your left brain. ~ Roger Ebert

Kurt Gödel's achievement in modern logic is singular and monumental – indeed it is more than a monument, it is a landmark which will remain visible far in space and time. ... The subject of logic has certainly completely changed its nature and possibilities with Gödel's achievement." - John von Neumann ~ John Von Neumann

Since God created man with certain unalienable rights, and man, in turn, created government to help secure and safeguard those rights, it follows that man is superior to the creature which he created. Man is superior to government and should remain master over it, not the other way around. Even the non-believer can appreciate the logic of this relationship. ~ Ezra Taft Benson

Any black person who clings to the misguided notion that white people represent the embodiment of all that is evil and black people all that is good remains wedded to the very logic of Western metaphysical dualism that is the heart of racist binary thinking. Such thinking is not liberatory. Like the racist educational ideology it mirrors and imitates, it invites a closing of the mind. ~ Bell Hooks

I love an art which allows me to document my place in this mix ... This is my past and my future. It has its own logic and finally, its own sense of fulfillment. ~ Burton Silverman

Narrative nonfiction is an act of conception and construction; it is formation of a personal legend from the mist of memory using mental hydraulics plied with the tools of logic, structure, design, and imagination. An engaged mind possesses a documentary sensibility that fabricates a memoirist identity, which alliance mollifies their bleak interior critic. A conscientious mind hews a residue of meaning from the verisimilitude of a person's metafictional baggage. A basic impulse of all free people is to speak to an appreciative audience. Writing the story of our life constitutes asserting the universal human right to declare and define who we are. When we write our story, we become a stakeholder of our place in the world, we affirm the right to shape our future, and avow the verity to heal our torn souls. ~ Kilroy J. Oldster

But remember, the logic of the inverted-U curve is that the same strategies that work really well at first stop working past a certain point, and that's exactly what many criminologists argue happens with punishment. ~ Malcolm Gladwell

From lies to forgeries the step is not so long, and I have written technical essays on the logic of forgeries and on the influence of forgeries on history. ~ Umberto Eco

The man in Bedroom A, Car No. 14, was a professor of philosophy who taught that there is no mind - how do you know that the tunnel is dangerous? - no reality - how can you prove that the tunnel exists? - no logic - why do you claim that trains cannot move without motive power? - no principles - why should you be bound by the law of cause-and-effect? - no rights - why shouldn't you attach men to their jobs by force? - no morality - what's moral about running a railroad? - no absolutes - what difference does it make to you whether you live or die, anyway? He taught that we know nothing - why oppose the orders of your superiors? - that we can never be certain of anything - how do you know you're right? - that we must act on the expediency of the moment - you don't want to risk your job, do you? The ~ Ayn Rand