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As to the objection that these rules are common in the world, that it is necessary to define every thing and to prove every thing, and that logicians themselves have placed them among their art, I would that the thing were true and that it were so well known... But so little is this the case, that, geometricians alone excepted, who are so few in number that they are a single in a whole nation and long periods of time, we see no others that know it.

 

Blaise Pascal

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The method of not erring is sought by all the world. The logicians profess to guide it, the geometricians alone attain it, and apart from science, and the imitations of it, there are no true demonstrations.

 

Blaise Pascal

 

Orthodox Judaism has this amazing set of rules: everyday there's a bunch of strictures of things you're supposed to do, a bunch you're not supposed to do, and the number you're supposed to do is the same number as the number of bones in the body. The number that you're not supposed to do is the same number as the number of days in the year. The amazing thing is, nobody knows what the rules are! Talmudic rabbis have been scratching each others' eyes out for centuries arguing over which rules go into the 613. The numbers are more important than the content. It is sheer numerology.

 

Robert Sapolsky

 

Our victory in Europe was more than a victory of arms.
It was a victory of one way of life over another. It was a victory of an ideal founded on the rights of the common man, on the dignity of the human being, on the conception of the State as the servant — and not the master — of its people.
A free people showed that it was able to defeat professional soldiers whose only moral arms were obedience and the worship of force.
We tell ourselves that we have emerged from this war the most powerful nation in the world — the most powerful nation, perhaps, in all history. That is true, but not in the sense some of us believe it to be true.
The war has shown us that we have tremendous resources to make all the materials for war. It has shown us that we have skillful workers and managers and able generals, and a brave people capable of bearing arms.
All these things we knew before.
The new thing — the thing which we had not known — the thing we have learned now and should never forget, is this: that a society of self-governing men is more powerful, more enduring, more creative than any other kind of society, however disciplined, however centralized.

 

Harry S. Truman

 

...when we wish to demonstrate a general theorem, we must give the rule as applied to a particular case; but if we wish to demonstrate a particular case, we must begin with the general rule. For we always find the thing obscure which we wish to prove, and that clear which we use for the proof; for, when a thing is put forward to be proved, we first fill ourselves with the imagination that it is therefore obscure, and on the contrary that what is to prove it, is clear, and so we understand it easily. 40

 

Blaise Pascal

 

These rules will enable you to have a free and sound judgment; since good judgment is born of clear understanding, and a clear understanding comes of reasons derived from sound rules, and sound rules are the issue of sound experience — the common mother of all the sciences and arts. Hence, bearing in mind the precepts of my rules, you will be able, merely by your amended judgment, to criticise and recognise every thing that is out of proportion in a work, whether in the perspective or in the figures or any thing else.

 

Leonardo da Vinci