Logic Quotes

I have previously reduced the whole science of logic to two facts.The first is that our perceptions being every thing for us, we areperfectly, completely, and necessarily sure of whatever we actually feel.The second is that consequently none of our judgments, separatelytaken, can be erroneous: inasmuch as we see one idea in another it isactually there; but their falsity, when it takes place, is purely relativeto anterior judgments, which we permit to subsist; and it consists inthis, that we believe the idea in which we perceive a new element tobe the same as that we have always had under the same sign, when itis really different, since the new element which we actually see thereis incompatible with some of those which we have previously seen;so that to avoid contradiction we must either take away the former ornot admit the latter.

~ Antoine Destutt De Tracy

sometimes the most logical thought that come out from our head is far from logic in reality.

~ Dian Agung Yogantara

Where logic reaches, religion leaves.

~ M.f. Moonzajer

What do you think science is? There's nothing magical about science. It is simply a systematic way for carefully and thoroughly observing nature and using consistent logic to evaluate results. Which part of that exactly do you disagree with? Do you disagree with being thorough? Using careful observation? Being systematic? Or using consistent logic?

~ Steven Novella

All men are mortal. Socrates was mortal. Therefore, all men are Socrates.

~ Woody Allen

There was no logic or any sense of purpose except that I knew I had to do something other than what I was doing, or I might not make it through this.

~ J.a. Redmerski

So each one of you agrees to disagree with whatever the other one agrees with, but if you both disagree with the same thing, aren't you really in agreement?

~ Norton Juster

I hold that belief in God is not merely as reasonable as other belief, or even a little or infinitely more probably true than other belief; I hold rather that unless you believe in God you can logically believe in nothing else

~ Cornelius Van Til

Turing attended Wittgenstein's lectures on the philosophy of mathematics in Cambridge in 1939 and disagreed strongly with a line of argument that Wittgenstein was pursuing which wanted to allow contradictions to exist in mathematical systems. Wittgenstein argues that he can see why people don't like contradictions outside of mathematics but cannot see what harm they do inside mathematics. Turing is exasperated and points out that such contradictions inside mathematics will lead to disasters outside mathematics: bridges will fall down. Only if there are no applications will the consequences of contradictions be innocuous. Turing eventually gave up attending these lectures. His despair is understandable. The inclusion of just one contradiction (like 0 = 1) in an axiomatic system allows any statement about the objects in the system to be proved true (and also proved false). When Bertrand Russel pointed this out in a lecture he was once challenged by a heckler demanding that he show how the questioner could be proved to be the Pope if 2 + 2 = 5. Russel replied immediately that 'if twice 2 is 5, then 4 is 5, subtract 3; then 1 = 2. But you and the Pope are 2; therefore you and the Pope are 1'! A contradictory statement is the ultimate Trojan horse.

~ John D. Barrow

There is a circularity here I do not doubt. I am defending the Bible by the Bible. Circularity of a kind is unavoidable when one seeks to defend an ultimate standard of truth, for one's defense must itself be accountable to that standard.

~ John M. Frame

Cursed luck! —said he, biting his lip as he shut the door, —for man to be master of one of the finest chains of reasoning in nature, —and have a wife at the same time with such a head-piece, that he cannot hang up a single inference within side of it, to save his soul from destruction.

~ Laurence Sterne

[The laws of logic] were placed in our minds by the Creator during the act of creation. We speak because God has spoken. God is not the author of confusion, irrationality, or the absurd. Furthermore, his words are meant to be understood by his creatures, and a necessary condition for his creature's understanding of those words is that they are intelligible and not irrational.

~ R.c. Sproul

Logic was puny in the face of my wrath. Logic was puny and magic was mighty: I had just gotten rebirthed, refilled and renewed, and was fast on my way to resentful.

~ C.e. Murphy

The only reason I'm writing this down is to show how human reason, even very sharp and exact human reason, can get crazily confused and thrown off the track.

~ Yevgeny Zamyatin

But...that doesn't make any sense...!''It does if you're a goat.

~ Linda Medley

Don't get involved in partial problems, but always take flight to where there is a free view over the whole single great problem, even if this view is still not a clear one

~ Ludwig Wittgenstein

So,” Marasi said, “you traded a dead man’s scarf for another dead man’s gun. But…the gun itself belonged to someone dead, so by the same logic—”“Don’t try,” Waxillium said. “Logic doesn’t work on Wayne.”“I bought a ward against it off a traveling fortune-teller,” Wayne explained. “It lets me add two ’n’ two and get a pickle.

~ Brandon Sanderson

When a man in a forest thinks he is going forward in a straight line, in reality he is going in a circle, I did my best to go in a circle, hoping to go in a straight line.

~ Samuel Beckett

Quentin was thin and tall, though he habitually hunched his shoulders in a vain attempt to brace himself against whatever blow was coming from the heavens, and which would logically hit the tall people first.

~ Lev Grossman

Painting is so poetic, while sculpture is more logical and scientific and makes you worry about gravity.

~ Damien Hirst

The man who cannot believe his senses, and the man who cannot believe anything else, are both insane, but their insanity is proved not by any error in their argument, but by the manifest mistake of their whole lives. They have both locked themselves up in two boxes, painted inside with the sun and stars; they are both unable to get out, the one into the health and happiness of heaven, the other even into the health and happiness of the earth.

~ G.k. Chesterton

The past is behind us unless we fail to learn from it.

~ L.m. Fields

I'm who i wasn't yesterday and who i won't be tomorrow.

~ Emmanuel Aghado

The expression e=mc2 is the ultimate statement in bounce per ounce.

~ Nigel S. Hey

Hope is independent of the apparatus of logic.

~ Norman Cousins

The interesting thing about humor is that in humor, you - in logic, something is A or not A. In humor, it's both A and not A.

~ Robert Mankoff

In the minds of a Liberal, someone who isn't Christian might be offended if we say Merry Christmas to them, so we shouldn't say Merry Christmas to anyone. The logic is bizarre!

~ Milo Yiannopoulos

Nature is the source of all true knowledge. She has her own logic, her own laws, she has no effect without cause nor invention without necessity.

~ Leonardo Da Vinci

There is science, logic, reason; there is thought verified by experience. And then there is California.

~ Edward Abbey

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

~ Thomas Huxley

Logic is neither an art nor a science but a dodge.

~ Stendhal

But however measurable, there is much more life in music than mathematics or logic ever dreamed of.

~ Gabriel Marcel

Renditions before and since 9/11 share some basic features. They have been conducted lawfully, responsibly and with a clear and single purpose: Get terrorists off the street and gain intelligence on those still at large. Our detention and interrogation programs flow from the same inescapable logic.

~ Michael Hayden

The great universal family of men is a utopia worthy of the most mediocre logic.

~ Comte De Lautréamont

Without this spirit, Modernist architecture cannot fully exist. Since there is often a mismatch between the logic and the spirit of Modernism, I use architecture to reconcile the two.

~ Tadao Ando

I loved logic, math, computer programming. I loved systems and logic approaches. And so I just figured architecture is this perfect combination.

~ Maya Lin

The logic of Palladian architecture presented an aesthetic formula which could be applied universally.

~ Stephen Gardiner

If I was influenced by anything, it was architecture: structure having to do with logic. If you don't do it right, the whole thing is going to cave in. In a certain sense, you can carry that to graphic design. Fortunately, however, nobody is going to die if you do it wrong.

~ Paul Rand

Shop often, shop hard, and spend for the best stuff available - logic dictates that you can make delicious food only with delicious ingredients.

~ Mario Batali

Religion is love in no case is it logic.

~ Beatrice Webb