Logic is the foundation of all scientific reasoning.

The knowledge of the theory of logic has no tendency whatever to make men good reasoners

My purity manifests itself in countless ways, including an utter inability to sit idly when exposed to attacks on truth, reason, logic, and/or individual dignity.

The purpose of education is to give the student the intellectual tools to analyze, whether verbally or numerically, and to reach conclusions based on logic and evidence

It is amazing how many people think that they can answer an argument by attributing bad motives to those who disagree with them. Using this kind of reasoning, you can believe or not believe anything about anything, without having to bother to deal with facts or logic

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

The greatest merit of the critical spirit is that it tends to cure fanaticism, and it is logical enough that in our own fanatical times the critical spirit should tend to disappear.

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

Man has such a predilection for systems and abstract deductions that he is ready to distort the truth intentionally he is ready to deny the evidence of his senses only to justify his logic.

Logic may indeed be unshakeable, but it cannot withstand a man who is determined to live.

Ideas should be neutral. But man animates them with his passions and folly. Impure and turned into beliefs, they take on the appearance of reality. The passage from logic is consummated. Thus are born ideologies, doctrines, and bloody farce.

Does fuzzy logic tickle?

You can sway a thousand men by appealing to their prejudices quicker than you can convince one man by logic.

But logic is not all, one needs one’s heart to follow an idea.

Mathematics is a language plus reasoning; it is like a language plus logic. Mathematics is a tool for reasoning.

If I could prove by logic that you would die in five minutes, I should be sorry you were going to die, but my sorrow would be very much mitigated by pleasure in the proof.

We have two lives, and the second begins when we realize we only have one.

Life does not listen to your logic; it goes on its own way, undisturbed. You have to listen to life.

A mind all logic is like a knife all blade. It makes the hand bleed that uses it.

You can only find truth with logic if you have already found truth without it.

All opinions are not equal. Some are a very great deal more robust, sophisticated and well supported in logic and argument than others.

Politics are not a science based on logic; they are the capacity of always choosing at each instant, in constantly changing situations, the least harmful, the most useful.

Let us aim for victory in the spring. You in the factories, you in the fields, you in uniforms; you citizens of the world, let us work and fight towards that end. You, official Washington, and you, official London, let us make this our aim – victory in the spring.

There is a loneliness in this world so great that you can see it in the slow movement of the hands of a clock

I probably hold the distinction of being one movie star who, by all laws of logic, should never have made it. At each stage of my career, I lacked the experience.

My ideas are of an indisputable logic; The only thing that makes me doubt is that they have not been applied previously

Only mathematics and mathematical logic can say as little as the physicist means to say. (1931)

Frege has the merit of … finding a third assertion by recognising the world of logic which is neither mental nor physical.