Geach, Peter

"A weak definition is the beginning of confusion."

"To argue well is to think well."

"The meaning of life is found in the exercise of reason."

"A person who cannot change their mind cannot grow."

"To speak truth without precision is to speak falsehood."

"The mind that avoids contradiction is the mind that avoids reality."

"Language reform is mind reform."

"To think clearly about ethics, one must think clearly about everything."

"A belief held without examination is a belief ready to crumble."

"The philosopher's greatest enemy is not ignorance but false certainty."

"To ask the right question is halfway to the answer."

"Clarity of thought is the first act of justice."

"A logically valid argument can still mislead if the premises are false."

"The mind that will not be corrected is the mind that will not grow."

"To understand grammar is to understand the structure of reality."

"A principle not lived is merely pretty words."

"The pursuit of truth is the highest human activity."

"To speak without thinking is to live without living."

"A concept cannot be both true and false in the same respect."

"Language is the vehicle of all knowledge; maintain it carefully."

"To reason poorly is to act poorly."

"The philosopher must be willing to follow the argument wherever it leads."

"A contradiction is not a paradox; it is an error."

"To think is to risk being wrong; but not to think is to guarantee it."

"The mind grows through challenge; comfort breeds stagnation."

"Precision in definition is the beginning of all understanding."

"A statement that cannot be tested cannot be claimed."

"To argue without charity is to argue without hope."

"The pursuit of excellence is the pursuit of clarity."

"A mind that settles too easily has stopped thinking."