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Logic Quotes

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Logic Quotes

“My theory stands as firm as a rock; every arrow directed against it will return quickly to its archer. How do I know this? Because I have studied it from all sides for many years; because I have examined all objections which have ever been made against the infinite numbers; and above all because I have followed its roots, so to speak, to the first infallible cause of all created things.”

“The actual infinite arises in three contexts: first when it is realized in the most complete form, in a fully independent otherworldly being, in Deo, where I call it the Absolute Infinite or simply Absolute; second when it occurs in the contingent, created world; third when the mind grasps it in abstracto as a mathematical magnitude, number or order type.”

“"There is one basis of science," says Descartes, "one test and rule of truth, namely, that whatever is clearly and distinctly conceived is true." A profound psychological mistake. It is true only of formal logic, wherein the mind never quits the sphere of its first assumptions to pass out into the sphere of real existences; no sooner does the mind pass from the internal order to the external order, than the necessity of verifying the strict correspondence between the two becomes absolute. The Ideal Test must be supplemented by the Real Test, to suit the new conditions of the problem.”

“The world of visual perspective is one of unified and homogeneous space. Such a world is alien to the resonating diversity of spoken words. So language was the last art to accept the visual logic of Gutenberg technology, and the first to rebound in the electric age.”

“At one time, many philosophers held that faultless "laws of thought" were somehow inherent, a priori, in the very nature of mind. This belief was twice shaken in the past century; first when Russell and his successors showed how the logic men employ can be defective, and later when Freud and Piaget started to reveal the tortuous ways in which our minds actually develop.”

“The trouble is that once America goes off to war, it can't very well return without having fought one. If it doesn't find its enemy, for the sake of the enraged folks back home, it will have to manufacture one. Once war begins, it will develop a momentum, a logic and a justification of its own, and we'll lose sight of why it's being fought in the first place.”

“Nothing is text but what is spoken of in the Bible and meant there for person and place; the rest is application; which a discreet man may do well; but it is his scripture, not the Holy Ghost's. First, in your sermons use your logic, and then your rhetoric; rhetoric without logic is like a tree with leaves and blossoms, but no root.”

“it was the United States which first established general suffrage for men upon the two principles that 'taxation without representation is tyranny' and that governments to be just should 'derive their consent from the governed.' The unanswerable logic of these two principles is responsible for the extension of suffrage to men and women the world over. In the United States, however, women are still taxed without 'representation' and still live under a government to which they have given no 'consent.”

“Brought up a Presbyterian, indoctrinated from the Catechism, and being naturally of an inquiring mind, I fell a ready prey to the logic of infidelity, as soon as I began to think for myself. But that which at first threatened to be the utter shipwreck of faith in God and the Bible was, under God's providence, over-ruled for good, and merely wrecked my confidence in human creed and systems of Bible misinterpretations.”

“The truth is, that common-sense, or thought as it first emerges above the level of the narrowly practical, is deeply imbued with that bad logical quality to which the epithet metaphysical is commonly applied; and nothing can clear it up but a severe course of logic.”

“The beauty of religious mania is that it has the power to explain everything. Once God (or Satan) is accepted as the first cause of everything which happens in the mortal world, nothing is left to chance ... or change. Once such incantatory phrases as "we see now through a glass darkly" and "mysterious are the ways". He chooses His wonders to perform" are mastered, logic can be happily tossed out the window". Religious mania is one of the few infallible ways of responding to the world's vagaries, because it totally eliminates pure accident. To the true religious maniac, it's all on purpose.”

“Especially among Christians in positions of wealth and power, the idea of reading the Gospels and keeping Jesus' commandments as stated therein has been replaced by a curious process of logic. According to this process, people first declare themselves to be followers of Christ, and then they assume that whatever they say or do merits the adjective "Christian".”

“Let no one rule your mind or body. Take special care that your thoughts remain unfettered... Give men your ear, but not your heart. Show respect for those in power, but don't follow them blindly. Judge with logic and reason, but comment not. Consider none your superior in life. Treat all fairly or they will seek revenge. Be careful with your money. Hold fast to your beliefs and others will listen.”

“Gradually, at various points in our childhoods, we discover different forms of conviction. There's the rock-hard certainty of personal experience ("I put my finger in the fire and it hurt,"), which is probably the earliest kind we learn. Then there's the logically convincing, which we probably come to first through maths, in the context of Pythagoras's theorem or something similar, and which, if we first encounter it at exactly the right moment, bursts on our minds like sunrise with the whole universe playing a great chord of C Major.”

“I approached the bulk of my schoolwork as a chore rather than an intellectual adventure. The tedium was relieved by a few courses that seem to be qualitatively different. Geometry was the first exciting course I remember. Instead of memorizing facts, we were asked to think in clear, logical steps. Beginning from a few intuitive postulates, far reaching consequences could be derived, and I took immediately to the sport of proving theorems.”

“We [may] answer the question: "Why is snow white?" by saying, "For the same reason that soap-suds or whipped eggs are white"-in other words, instead of giving the reason for a fact, we give another example of the same fact. This offering a similar instance, instead of a reason, has often been criticised as one of the forms of logical depravity in men. But manifestly it is not a perverse act of thought, but only an incomplete one. Furnishing parallel cases is the necessary first step towards abstracting the reason imbedded in them all.”

“Understanding the often unconscious nature of genetic control is the first step toward understanding that—in many realms, not just sex—we’re all puppets, and our best hope for even partial liberation is to try to decipher the logic of the puppeteer.”

“In the first place a philosophical proposition must be general. It must not deal specially with things on the surface of the earth, or within the solar system, or with any other portion of space and time. . . . This brings us to a second characteristic of philosophical propositions, namely that they must be a priori. A philosophical proposition must be such as can neither be proved nor disproved by empirical evidence. . . . Philosophy, if what has been said is correct, becomes indistinguishable from logic as that word has now come to be used.”

“My philosophy is that once you get people compelled enough to sit down and play the game, the whole way you make the game successful is by giving them enough unique ways to do things. First, let them deal with pulling levers and things like that for a while. Then after they've mastered that, you give them something else to do, like getting through doorways by blasting them down with a cannon Next, you give them a monster-finding quest, followed by logic problems to figure out. You pace it that way. Assorted activities and the diversity of activities are what makes a game rich in my mind.”

“Among all the liberal arts, the first is logic, and specifically that part of logic which gives initial instruction about words. ... [T]he word "logic" has a broad meaning, and is not restricted exclusively to the science of argumentative reasoning. [It includes] Grammar [which] is "the science of speaking and writing correctly-the starting point of all liberal studies."”

“I end with a word on the new symbols which I have employed. Most writers on logic strongly object to all symbols. ... I should advise the reader not to make up his mind on this point until he has well weighed two facts which nobody disputes, both separately and in connexion. First, logic is the only science which has made no progress since the revival of letters; secondly, logic is the only science which has produced no growth of symbols.”

“Catastrophe Theory is-quite likely-the first coherent attempt (since Aristotelian logic) to give a theory on analogy. When narrow-minded scientists object to Catastrophe Theory that it gives no more than analogies, or metaphors, they do not realise that they are stating the proper aim of Catastrophe Theory, which is to classify all possible types of analogous situations.”