Neither Aristotelian nor Russellian rules give the exact logic of any expression of ordinary language; for ordinary language has no exact logic.
There is something about poetry beyond prose logic, there is mystery in it, not to be explained but admired.
Bad reasoning as well as good reasoning is possible; and this fact is the foundation of the practical side of logic.
Logic is not a body of doctrine, but a mirror-image of the world. Logic is transcendental.
The logic of validation allows us to move between the two limits of dogmatism and skepticism.
I demand that my books be judged with utmost severity, by knowledgeable people who know the rules of grammar and of logic, and who will seek beneath the footsteps of my commas the lice of my thought in the head of my style.
Logic takes care of itself; all we have to do is to look and see how it does it.
Dialectic thought is an attempt to break through the coercion of logic by its own means.
Pain always produces logic, which is very bad for you.
A mind all logic is like a knife all blade. It makes the hand bleed that uses it.