„The logical picture of the facts is the thought.“

— Ludwig Wittgenstein
„Invention is not the product of logical thought, even though the final product is tied to a logical structure.“
— Albert Einstein
„Philosophy aims at the logical clarification of thoughts. Philosophy is not a body of doctrine but an activity.“
— Ludwig Wittgenstein
„In certain intellectual circles in France, the very basis for discussion—a minimal respect for facts and logic—has been virtually abandoned.“
— Noam Chomsky