Logic Quotes

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From semantics to shipbuilding, from dream theory to propositional logic, any specialist … is invariably astonished to discover that modern knowledge was foreshadowed at the time. … Should we not replace these foreshadowings by the study of the influences of Hellenistic thought on modern thought?

Science attempts to find logic and simplicity in nature. Mathematics attempts to establish order and simplicity in human thought.

I've done my best, but the boy is unteachable. He doubts everything, and contests each point of theology as if it were required to meet the same tests of logic and consistency that prevail in the world of science.
In other words, he expects your doctrines to make sense.
He is unwilling to accept the idea that some things remain mysteries, comprehensible only to the mind of God. Ambiguity makes him saucy, and paradox causes open rebellion.
An obnoxious child.

Orson Scott Card

The individual's life is of importance to none besides himself: the point is whether he wishes to escape from history or give his life for it. History recks nothing of human logic

Oswald Spengler

You can't choose between evil and evil, in the dark, by logic. You can only cling to some safety line of principle.

Lois McMaster Bujold

That logic, as a science, is susceptible of very wide applications is admitted; but it is equally certain that its ultimate forms and processes are mathematical.

Geometry is that of mathematical science which is devoted to consideration of form and size, and may be said to be the best and surest guide to study of all sciences in which ideas of dimension or space are involved. Almost all the knowledge required by navigators, architects, surveyors, engineers, and opticians, in their respective occupations, is deduced from geometry and branches of mathematics. All works of art constructed according to the rules which geometry involves; and we find the same laws observed in the works of nature. The study of mathematics, generally, is also of great importance in cultivating habits of exact reasoning; and in this respect it forms a useful auxiliary to logic.

Robert Chambers

The ingenuity and effective logic that enabled chemists to determine complex molecular structures from the number of isomers, the reactivity of the molecule and of its fragments, the freezing point, the empirical formula, the molecular weight, etc., is one of the outstanding triumphs of the human mind.

Henry Eyring (chemist)

The Grape that can with Logic absolute
The Two-and-Seventy jarring Sects confute:
The sovereign Alchemist that in a trice
Life's leaden metal into Gold transmute:
LX.

Woman was an idol of belly-magic. She seemed to swell and give birth by her own law. From the beginning of time, woman has seemed an uncanny being. Man honored but feared her. She was the black maw that had spat him forth and would devour him anew. Men, bonding together, invented culture as a defense against female nature. Sky-cult was the most sophisticated step in this process, for its switch of the creative locus from earth to sky is a shift from belly-magic to head-magic. And from this defensive head-magic has come the spectacular glory of male civilization, which has lifted woman with it. The very language and logic modern woman uses to assail patriarchal culture were the invention of men.

My Father taught me how to be a man – and not by instilling in me a sense of machismo or an agenda of dominance. He taught me that a real man doesn't take, he gives; he doesn't use force, he uses logic; doesn't play the role of trouble-maker, but rather, trouble-shooter; and most importantly, a real man is defined by what's in his heart, not his pants.

A classical concept in Hinduism has been that a true proposition has to be consistent with sruti, yukti (reason/logic) and anubhava.

In the past, when people criticized me for asking unexpected questions, I felt ashamed. Now I realize that normal people are acting in a superficial and often false manner. So rather than let them make me feel bad, I express my annoyance. It's my way of trying to strike a blow for logic and rationality.

John Elder Robison

One of the most common ways to overcome resistance to change is to educate people about it beforehand. Communication of ideas helps people see the need for and the logic of a change. The education process can involve one-on-one discussions, presentations to groups, or memos and reports.

The lapse of time during which a given event has not happened, is, in this logic of habit, constantly alleged as a reason why the event should never happen, even when the lapse of time is precisely the added condition which makes the event imminent. A man will tell you that he has worked in a mine for forty years unhurt by an accident as a reason why he should apprehend no danger, though the roof is beginning to sink...

It seems that extremists on both sides are determined to maintain the state of hostility and hatred between the two states, but logic says that there should be a change of direction in order to turn a new page in this unstable relationship and minimise the state of hostility and mistrust between the two countries.

We Americans claim to be a peace-loving people. We hate bloodshed; we are opposed to violence. Yet we go into spasms of joy over the possibility of projecting dynamite bombs from flying machines upon helpless citizens. We are ready to hang, electrocute, or lynch anyone, who, from economic necessity, will risk his own life in the attempt upon that of some industrial magnate. Yet our hearts swell with pride at the thought that America is becoming the most powerful nation on earth, and that she will eventually plant her iron foot on the necks of all other nations.
Such is the logic of patriotism.

In randori we learn to employ the principle of maximum efficiency even when we could easily overpower an opponent. Indeed, it is much more impressive to beat an opponent with proper technique than with brute force. This lesson is equally applicable in daily life: the student realized persuasion backed up by sound logic is ultimately more effective than coercion.

The soul cannot be humbled by fasts and prayer; it must be broken by mortal sin to experience forgiveness of sin and rise to a state of grace. Otherwise, religion is nothing but dead logic.

It is by logic that we prove, but by intuition that we discover. To know how to criticize is good, to know how to create is better.

In French: C'est par la logique qu'on démontre, c'est par l'intuition qu'on invente.

Henri Poincaré

As long as a society's best minds were occupied by theological questions, it was possible to speak of a given religion as the way of thinking of the whole social organism. All the matters which most actively concerned the people were referred to it and discussed in its terms. But that belongs to a dying era. We have come by easy stages to a lack of a common system of thought that could unite the peasant cutting his hay, the student poring over formal logic, and the mechanic working in an automobile factory. Out of this lack arises the painful sense of detachment or abstraction that oppresses the "creators of culture."

Czesław Miłosz

The purpose of this book is to show how economic analysis can be used in formulating business policies. It is therefore a departure from the main stream of economic writings on the theory of the firm, much of which is too simple in its assumptions and too complicated in its logical development to be managerially useful. The big gap between the problems of logic that intrigue economic theorists and the problems of policy that plague practical management needs to be bridged in order to give executives access to the practical contributions that economic thinking can make to top-management policies.

The development of information research has increased considerably the interaction of emerging information science with other disciplines. Librarianship has traditionally had links with education and classification and has drawn ideas from logic and philosophy. But during the last fifty years new insights and methods have been derived from sociology and social psychology, from computer science, from operations research and related quantitative approaches, from communications research, from linguistics, and most recently from the new hybrids: cognitive science and artificial intelligence.

Brian Campbell Vickery

The White Protestant's ultimate sympathy must be with science, factology, and committee rather than with sex, birth, heat, flesh, creation, the sweet and the funky; they must vote, manipulate, control, and direct, these Protestants who are the center of power in our land, they must go for what they believe is reason when it is only the Square logic of the past.

After all, what was the whole wide world but a place for people to yearn for their heart's impossible desires, for those desires to become entrenched in defiance of logic, plausibility, and even the passage of time, as eternal as polished marble.