Able Quote by Immanuel Kant

That Logic has advanced in this sure course, even from the earliest times, is apparent from the fact that, since Aristotle, it has been…

— Immanuel Kant

Nothing new had been done in Logic since Aristotle!

— Kurt Gödel

“In formal logic, a contradiction is the signal of a defeat; but in the evolution of real knowledge it marks the first step in…

— Alfred North Whitehead

“the key-exercise will be Formal Logic. It is here that our curriculum shows its first sharp divergence from modern standards. The disrepute into which…

— Dorothy L. Sayers

But it is certainly not possible to insist on one hand that the formalism is complete and to insist on the other hand that…

— Karl Popper

We can no longer assert any single proposition, unless we guard ourselves by enumerating countless conditions which must be assumed.

— Aleister Crowley

Formality Thus the absence of all mention of particular things or properties in logic or pure mathematics is a necessary result of the fact…

— Bertrand Russell

It could be that the methods needed to take the next step may simply be beyond present day mathematics. Perhaps the methods I needed…

— Andrew Wiles

“Ideas after Aristotle multiplied but did not progress.”

— John Mark Reynolds

Aristotle can be regarded as the father of logic. But his logic is too scholastic, full of subtleties, and fundamentally has not been of…

— Immanuel Kant

“Logic was, formerly, the art of drawing inferences; it has now become the art of abstaining from inferences, since it has appeared that the…

— Bertrand Russell

This means that no single logic is strong enough to support the total construction of human knowledge.

— Jean Piaget