The worse your logic, the more interesting the consequences to which it gives rise.

Men are born ignorant, not stupid; they are made stupid by education.

Not to be absolutely certain is, I think, one of the essential things in rationality.

Hume, by his criticism of the concept of causality, awakened him from his dogmatic slumbers-so at least he says, but the awakening was only temporary, and he s…

Her reasoning is full of tricks And butterfly suggestions, I know no point to which she sticks; She begs the simplest questions, And, when her premises are str…

Aristotle... a mere bond-servant to his logic, thereby rendering it contentious and well nigh useless.

Logician: A cat has four paws. Old Gentleman: My dog had four paws. Logician: Then it's a cat. Old Gentleman: So my dog is a cat? Logician: And the contrary is…