Frege, Gottlob

"Conceptual clarity is the foundation of all genuine knowledge."

"We should never mistake the sign for what it signifies."

"The logical form of a thought can be expressed through symbolic notation."

"Ideas exist in the realm of sense, not in individual minds."

"To think is to grasp a thought, not to generate a mental image."

"Objectivity demands that we recognize truths independent of preference."

"The meaning of a word lies in its use within a systematic language."

"Philosophy must free itself from the tyranny of psychology."

"Numbers are not properties of physical objects but abstract entities."

"Conceptual confusion is the root of philosophical error."

"A proposition asserts what is the case, not what we wish to be the case."

"The structure of reality is reflected in the structure of valid thought."

"We must distinguish the mental act from its content."

"Language, properly analyzed, reveals the logical form of reality."

"To be is not the same as to be thinkable."

"Logic is the science of the laws of thought."

"Understanding requires abandoning intuition in favor of analysis."

"Sense and reference are not the same, though they are related."

"The natural sciences describe; logic prescribes."

"We must learn to distinguish appearance from reality."

"Thought is not a private possession but something objective and eternal."

"The meaning of a name is the object it denotes."

"Clarity of expression is clarity of thought."

"Every valid inference preserves truth through logical necessity."

"We cannot think what is logically contradictory."

"The concept is what remains when we remove the marks of individual thinkers."

"To understand a thought is to grasp its logical structure."

"Reality constrains our thoughts; our thoughts do not create reality."

"The task of science is to discover necessary truths."

"A function is the fundamental logical operation."