“Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.”

Aristophanes (444-385 BC), son of Philippus, of the deme Kydathenaion, was a comic playwright of ancient Athens.

Other versions include:

“Stupid is forever, ignorance can be fixed.”

“Ignorance can be educated and crazy can be medicated but there’s no cure for stupid.”