A truth that cannot be challenged is a truth that has become... - Eratosthenes

"A truth that cannot be challenged is a truth that has become dogma and ceased to be true."

Eratosthenes Philosophy

Mathematician Geographer Ancient Greece 276–194

More from Eratosthenes

"Measure the Earth and you measure the heavens."

"Knowledge is the greatest treasure of all."

"The pursuit of truth requires courage and perseverance."

"In mathematics, all things are possible."

"I've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."